{"id":"CVE-2019-20840","aliases":["ALPINE-CVE-2019-20840","DEBIAN-CVE-2019-20840","EUVD-2019-11377","GHSA-42fc-843w-r7rp","SUSE-SU-2020:1922-1","SUSE-SU-2020:2167-1","UBUNTU-CVE-2019-20840","USN-4434-1","openSUSE-SU-2020:0988-1","openSUSE-SU-2020:1025-1","openSUSE-SU-2020:1056-1","openSUSE-SU-2024:10598-1"],"status":"published","title":"An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a...","description":"An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.02733,"percentile":0.86202,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-119","CWE-787"],"published":"2020-06-17T15:11:10Z","modified":"2026-11-03T06:31:56Z","fixes":[{"ecosystem":"Alpine:v3.12","package":"libvncserver","fixed_in":["0.9.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"libvncserver","fixed_in":["0.9.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"libvncserver","fixed_in":["0.9.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"libvncserver","fixed_in":["0.9.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"libvncserver","fixed_in":["0.9.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"libvncserver","fixed_in":["0.9.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"libvncserver","fixed_in":["0.9.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"libvncserver","fixed_in":["0.9.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"libvncserver","fixed_in":["0.9.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"libvncserver","fixed_in":["0.9.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"libvncserver","fixed_in":["0.9.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"libvncserver","fixed_in":["0.9.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"libvncserver","fixed_in":["0.9.13-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"libvncserver","fixed_in":["0.9.13+dfsg-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"libvncserver","fixed_in":["0.9.13+dfsg-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"libvncserver","fixed_in":["0.9.13+dfsg-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"libvncserver","fixed_in":["0.9.10+dfsg-3ubuntu0.16.04.5"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"libvncserver","fixed_in":["0.9.11+dfsg-1ubuntu1.3"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.12","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.13","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.14","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.15","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.16","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.17","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13+dfsg-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13+dfsg-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.13+dfsg-1"}]}]},{"source":"osv","ecosystem":"SUSE:Linux 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Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-20840"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4F6FUH4EFK4NAP6GT4TQRTBKWIRCZLIY/"},{"url":"https://github.com/advisories/GHSA-42fc-843w-r7rp"},{"url":"https://security.alpinelinux.org/vuln/CVE-2019-20840","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2019-20840","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2020/suse-su-20201922-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1173477","tags":["report"]},{"url":"https://bugzilla.suse.com/1173691","tags":["report"]},{"url":"https://bugzilla.suse.com/1173694","tags":["report"]},{"url":"https://bugzilla.suse.com/1173700","tags":["report"]},{"url":"https://bugzilla.suse.com/1173701","tags":["report"]},{"url":"https://bugzilla.suse.com/1173743","tags":["report"]},{"url":"https://bugzilla.suse.com/1173874","tags":["report"]},{"url":"https://bugzilla.suse.com/1173875","tags":["report"]},{"url":"https://bugzilla.suse.com/1173876","tags":["report"]},{"url":"https://bugzilla.suse.com/1173880","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2017-18922","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-21247","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-20839","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-20840","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-14397","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-14398","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-14399","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-14400","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-14401","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-14402","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2020/suse-su-20202167-1/","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2020-14403","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-14404","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2019-20840","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4434-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-20840","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2019-20839","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-14396","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-14397","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-14398","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-14399","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-14400","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-14401","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-14402","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-14403","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-14404","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-14405","tags":["report"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/RH2MWYCQ3Y7WV6I2GEEBEI2J57NGY36J/","tags":["advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/MRXTN4MBX2MAHYVC2KCQATTKYECU2TZT/","tags":["advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/MWRQ72I3AY52E4KTKKWCJGWKFGVHI5FP/","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2006-2450","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-15126","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-15127","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-20019","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-20020","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-20021","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-20022","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-20023","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-20024","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-20748","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-20749","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-20750","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-6307","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-7225","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-15681","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-15690","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-20788","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25708","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2019-20840","description":"An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.","status":"published","published":"2020-06-17T15:11:10Z","modified":"2024-08-05T02:53:09.404Z","updated_at":"2026-11-02T14:20:17.431882Z"}],"euvd":[{"id":"EUVD-2019-11377","description":"An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.","status":"published","published":"2020-06-17T15:11:10Z","modified":"2024-08-05T02:53:09Z","updated_at":"2026-11-03T02:40:20.270172Z"}],"ghsa":[{"id":"GHSA-42fc-843w-r7rp","title":"An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a...","description":"An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.","status":"published","published":"2022-05-24T17:20:41Z","modified":"2023-01-29T05:03:02Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-119","CWE-787"],"updated_at":"2026-11-02T14:45:13.764942Z"}],"nvd":[{"id":"CVE-2019-20840","description":"An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.","status":"published","published":"2020-06-17T16:15:11.523Z","modified":"2026-06-17T02:31:17.807Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:05:47.558959Z"}],"osv":[{"id":"ALPINE-CVE-2019-20840","description":"An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.","status":"published","published":"2020-06-17T16:15:11.523Z","modified":"2026-11-03T06:31:56.568666833Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T07:18:15.355745Z"},{"id":"CVE-2019-20840","description":"An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.","status":"published","published":"2020-06-17T16:15:11.523Z","modified":"2026-10-20T13:42:59.045128547Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:12.010761Z"},{"id":"DEBIAN-CVE-2019-20840","description":"An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.","status":"published","published":"2020-06-17T16:15:11.523Z","modified":"2026-09-21T07:00:32.30458236Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:32.221385Z"},{"id":"UBUNTU-CVE-2019-20840","description":"An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.","status":"published","published":"2020-06-17T16:15:00Z","modified":"2026-10-17T12:56:07.577190576Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:21.213407Z"},{"id":"openSUSE-SU-2020:0988-1","title":"Security update for LibVNCServer","description":"This update for LibVNCServer fixes the following issues:\n\n- security update\n- added patches\n  fix CVE-2018-21247 [bsc#1173874], uninitialized memory contents are vulnerable to Information leak\n  + LibVNCServer-CVE-2018-21247.patch\n  fix CVE-2019-20839 [bsc#1173875], buffer overflow in ConnectClientToUnixSock()\n  + LibVNCServer-CVE-2019-20839.patch\n  fix CVE-2019-20840 [bsc#1173876], unaligned accesses in hybiReadAndDecode can lead to denial of service\n  + LibVNCServer-CVE-2019-20840.patch\n  fix CVE-2020-14398 [bsc#1173880], improperly closed TCP connection causes an infinite loop in libvncclient/sockets.c\n  + LibVNCServer-CVE-2020-14398.patch\n  fix CVE-2020-14397 [bsc#1173700], NULL pointer dereference in libvncserver/rfbregion.c\n  + LibVNCServer-CVE-2020-14397.patch\n  fix CVE-2020-14399 [bsc#1173743], Byte-aligned data is accessed through uint32_t pointers in libvncclient/rfbproto.c.\n  + LibVNCServer-CVE-2020-14399.patch\n  fix CVE-2020-14400 [bsc#1173691], Byte-aligned data is accessed through uint16_t pointers in libvncserver/translate.c.\n  + LibVNCServer-CVE-2020-14400.patch\n  fix CVE-2020-14401 [bsc#1173694], potential integer overflows in libvncserver/scale.c\n  + LibVNCServer-CVE-2020-14401.patch\n  fix CVE-2020-14402 [bsc#1173701], out-of-bounds access via encodings.\n  + LibVNCServer-CVE-2020-14402,14403,14404.patch\n  fix CVE-2017-18922 [bsc#1173477], preauth buffer overwrite\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2020-07-18T12:27:09Z","modified":"2026-02-04T02:53:39.671564Z","updated_at":"2026-11-02T16:58:31.152112Z"},{"id":"openSUSE-SU-2020:1025-1","title":"Security update for LibVNCServer","description":"This update for LibVNCServer fixes the following issues:\n\n- security update\n- added patches\n  fix CVE-2018-21247 [bsc#1173874], uninitialized memory contents are vulnerable to Information leak\n  + LibVNCServer-CVE-2018-21247.patch\n  fix CVE-2019-20839 [bsc#1173875], buffer overflow in ConnectClientToUnixSock()\n  + LibVNCServer-CVE-2019-20839.patch\n  fix CVE-2019-20840 [bsc#1173876], unaligned accesses in hybiReadAndDecode can lead to denial of service\n  + LibVNCServer-CVE-2019-20840.patch\n  fix CVE-2020-14398 [bsc#1173880], improperly closed TCP connection causes an infinite loop in libvncclient/sockets.c\n  + LibVNCServer-CVE-2020-14398.patch\n  fix CVE-2020-14397 [bsc#1173700], NULL pointer dereference in libvncserver/rfbregion.c\n  + LibVNCServer-CVE-2020-14397.patch\n  fix CVE-2020-14399 [bsc#1173743], Byte-aligned data is accessed through uint32_t pointers in libvncclient/rfbproto.c.\n  + LibVNCServer-CVE-2020-14399.patch\n  fix CVE-2020-14400 [bsc#1173691], Byte-aligned data is accessed through uint16_t pointers in libvncserver/translate.c.\n  + LibVNCServer-CVE-2020-14400.patch\n  fix CVE-2020-14401 [bsc#1173694], potential integer overflows in libvncserver/scale.c\n  + LibVNCServer-CVE-2020-14401.patch\n  fix CVE-2020-14402 [bsc#1173701], out-of-bounds access via encodings.\n  + LibVNCServer-CVE-2020-14402,14403,14404.patch\n  fix CVE-2017-18922 [bsc#1173477], preauth buffer overwrite\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2020-07-21T08:27:26Z","modified":"2026-02-04T02:38:47.939233Z","updated_at":"2026-11-02T16:58:31.517538Z"},{"id":"openSUSE-SU-2020:1056-1","title":"Security update for LibVNCServer","description":"This update for LibVNCServer fixes the following issues:\n\n- security update\n- added patches\n  fix CVE-2018-21247 [bsc#1173874], uninitialized memory contents are vulnerable to Information leak\n  + LibVNCServer-CVE-2018-21247.patch\n  fix CVE-2019-20839 [bsc#1173875], buffer overflow in ConnectClientToUnixSock()\n  + LibVNCServer-CVE-2019-20839.patch\n  fix CVE-2019-20840 [bsc#1173876], unaligned accesses in hybiReadAndDecode can lead to denial of service\n  + LibVNCServer-CVE-2019-20840.patch\n  fix CVE-2020-14398 [bsc#1173880], improperly closed TCP connection causes an infinite loop in libvncclient/sockets.c\n  + LibVNCServer-CVE-2020-14398.patch\n  fix CVE-2020-14397 [bsc#1173700], NULL pointer dereference in libvncserver/rfbregion.c\n  + LibVNCServer-CVE-2020-14397.patch\n  fix CVE-2020-14399 [bsc#1173743], Byte-aligned data is accessed through uint32_t pointers in libvncclient/rfbproto.c.\n  + LibVNCServer-CVE-2020-14399.patch\n  fix CVE-2020-14400 [bsc#1173691], Byte-aligned data is accessed through uint16_t pointers in libvncserver/translate.c.\n  + LibVNCServer-CVE-2020-14400.patch\n  fix CVE-2020-14401 [bsc#1173694], potential integer overflows in libvncserver/scale.c\n  + LibVNCServer-CVE-2020-14401.patch\n  fix CVE-2020-14402 [bsc#1173701], out-of-bounds access via encodings.\n  + LibVNCServer-CVE-2020-14402,14403,14404.patch\n  fix CVE-2017-18922 [bsc#1173477], preauth buffer overwrite\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2020-07-24T12:20:15Z","modified":"2026-02-04T02:28:13.003232Z","updated_at":"2026-11-02T16:58:31.517538Z"},{"id":"openSUSE-SU-2024:10598-1","title":"LibVNCServer-devel-0.9.13-3.1 on GA media","description":"These are all security issues fixed in the LibVNCServer-devel-0.9.13-3.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T03:15:49.041318Z","updated_at":"2026-11-02T16:58:34.487567Z"},{"id":"SUSE-SU-2020:1922-1","title":"Security update for LibVNCServer","description":"This update for LibVNCServer fixes the following issues:\n\n- security update\n- added patches\n  fix CVE-2018-21247 [bsc#1173874], uninitialized memory contents are vulnerable to Information leak\n  + LibVNCServer-CVE-2018-21247.patch\n  fix CVE-2019-20839 [bsc#1173875], buffer overflow in ConnectClientToUnixSock()\n  + LibVNCServer-CVE-2019-20839.patch\n  fix CVE-2019-20840 [bsc#1173876], unaligned accesses in hybiReadAndDecode can lead to denial of service\n  + LibVNCServer-CVE-2019-20840.patch\n  fix CVE-2020-14398 [bsc#1173880], improperly closed TCP connection causes an infinite loop in libvncclient/sockets.c\n  + LibVNCServer-CVE-2020-14398.patch\n  fix CVE-2020-14397 [bsc#1173700], NULL pointer dereference in libvncserver/rfbregion.c\n  + LibVNCServer-CVE-2020-14397.patch\n  fix CVE-2020-14399 [bsc#1173743], Byte-aligned data is accessed through uint32_t pointers in libvncclient/rfbproto.c.\n  + LibVNCServer-CVE-2020-14399.patch\n  fix CVE-2020-14400 [bsc#1173691], Byte-aligned data is accessed through uint16_t pointers in libvncserver/translate.c.\n  + LibVNCServer-CVE-2020-14400.patch\n  fix CVE-2020-14401 [bsc#1173694], potential integer overflows in libvncserver/scale.c\n  + LibVNCServer-CVE-2020-14401.patch\n  fix CVE-2020-14402 [bsc#1173701], out-of-bounds access via encodings.\n  + LibVNCServer-CVE-2020-14402,14403,14404.patch\n  fix CVE-2017-18922 [bsc#1173477], preauth buffer overwrite\n","status":"published","published":"2020-07-15T09:31:09Z","modified":"2026-02-04T02:30:28.532499Z","updated_at":"2026-11-02T15:53:47.634847Z"},{"id":"SUSE-SU-2020:2167-1","title":"Security update for LibVNCServer","description":"This update for LibVNCServer fixes the following issues:\n\n- security update\n  fix CVE-2018-21247 [bsc#1173874], uninitialized memory contents are vulnerable to Information leak\n  fix CVE-2019-20839 [bsc#1173875], buffer overflow in ConnectClientToUnixSock()\n  fix CVE-2019-20840 [bsc#1173876], unaligned accesses in hybiReadAndDecode can lead to denial of service\n  fix CVE-2020-14398 [bsc#1173880], improperly closed TCP connection causes an infinite loop in libvncclient/sockets.c\n  fix CVE-2020-14397 [bsc#1173700], NULL pointer dereference in libvncserver/rfbregion.c\n  fix CVE-2020-14399 [bsc#1173743], Byte-aligned data is accessed through uint32_t pointers in libvncclient/rfbproto.c.\n  fix CVE-2020-14400 [bsc#1173691], Byte-aligned data is accessed through uint16_t pointers in libvncserver/translate.c.\n  fix CVE-2020-14401 [bsc#1173694], potential integer overflows in libvncserver/scale.c\n  fix CVE-2020-14402 [bsc#1173701], out-of-bounds access via encodings.\n  fix CVE-2020-14403 [bsc#1173701], out-of-bounds access via encodings.\n  fix CVE-2020-14404 [bsc#1173701], out-of-bounds access via encodings.\n  fix CVE-2017-18922 [bsc#1173477], preauth buffer overwrite\n","status":"published","published":"2020-08-07T12:54:44Z","modified":"2026-02-04T02:41:32.568422Z","updated_at":"2026-11-02T15:53:48.11786Z"},{"id":"USN-4434-1","title":"libvncserver vulnerabilities","description":"Ramin Farajpour Cami discovered that LibVNCServer incorrectly handled\ncertain malformed unix socket names. A remote attacker could exploit this\nwith a crafted socket name, leading to a denial of service, or possibly\nexecute arbitrary code. (CVE-2019-20839)\n\nIt was discovered that LibVNCServer did not properly access byte-aligned\ndata. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. This issue only\naffected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)\n\nChristian Beier discovered that LibVNCServer incorrectly handled anonymous\nTLS connections. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. This issue only\naffected Ubuntu 20.04 LTS. (CVE-2020-14396)\n\nIt was discovered that LibVNCServer incorrectly handled region clipping. A\nremote attacker could possibly use this issue to cause LibVNCServer to\ncrash, resulting in a denial of service. (CVE-2020-14397)\n\nIt was discovered that LibVNCServer did not properly reset incorrectly\nterminated TCP connections. A remote attacker could possibly use this\nissue to cause an infinite loop, resulting in a denial of service.\n(CVE-2020-14398)\n\nIt was discovered that LibVNCServer did not properly access byte-aligned\ndata. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399,\nCVE-2020-14400)\n\nIt was discovered that LibVNCServer incorrectly handled screen scaling on\nthe server side. A remote attacker could use this issue to cause\nLibVNCServer to crash, resulting in a denial of service, or possibly\nexecute arbitrary code. (CVE-2020-14401)\n\nIt was discovered that LibVNCServer incorrectly handled encodings. A\nremote attacker could use this issue to cause LibVNCServer to crash,\nresulting in a denial of service, or possibly execute arbitrary code.\n(CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)\n\nIt was discovered that LibVNCServer incorrectly handled TextChat messages.\nA remote attacker could possibly use this issue to cause LibVNCServer to\ncrash, resulting in a denial of service. (CVE-2020-14405)\n","status":"published","published":"2020-07-23T20:09:25Z","modified":"2026-04-27T15:48:46.367539073Z","updated_at":"2026-11-02T16:58:14.547547Z"}]}}