{"id":"CVE-2018-21247","aliases":["ALSA-2021:1811","DEBIAN-CVE-2018-21247","DLA-1617-1","DSA-4383-1","EUVD-2018-13762","GHSA-355f-mpqr-3mwv","RHSA-2021:1811","RLSA-2021:1811","SUSE-SU-2020:1922-1","SUSE-SU-2020:2167-1","UBUNTU-CVE-2018-21247","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. There is a memory leak in the libvncclient...","description":"An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.02352,"percentile":0.83831,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-200","CWE-909"],"published":"2018-12-25T00:00:00Z","modified":"2026-10-29T11:00:51Z","fixes":[{"ecosystem":"Debian:12","package":"libvncserver","fixed_in":["0.9.11+dfsg-1.2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"libvncserver","fixed_in":["0.9.11+dfsg-1.2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"libvncserver","fixed_in":["0.9.11+dfsg-1.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"AlmaLinux:8","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.11-17.el8"}]}],"bundled":5},{"source":"osv","ecosystem":"AlmaLinux:8","package":"libvncserver-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.11-17.el8"}]}],"bundled":5},{"source":"osv","ecosystem":"Debian:12","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.11+dfsg-1.2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.11+dfsg-1.2"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.11+dfsg-1.2"}]}]},{"source":"osv","ecosystem":"Debian:8","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.9+dfsg2-6.1+deb8u4"}]}],"versions":["0.9.9+dfsg-6.1","0.9.9+dfsg2-6.1+deb8u1","0.9.9+dfsg2-6.1+deb8u2","0.9.9+dfsg2-6.1+deb8u3"],"bundled":9},{"source":"osv","ecosystem":"Debian:9","package":"libvncserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.11+dfsg-1.3~deb9u1"}]}],"versions":["0.9.11+dfsg-1","0.9.11+dfsg-1+deb9u1","0.9.11+dfsg-1.1","0.9.11+dfsg-1.2"],"bundled":10},{"source":"osv","ecosystem":"Red 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ists.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-2018-21247","description":"An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.","status":"published","published":"2020-06-17T15:10:51Z","modified":"2024-08-05T12:26:39.514Z","updated_at":"2026-11-02T14:35:02.289647Z"}],"euvd":[{"id":"EUVD-2018-13762","description":"An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.","status":"published","published":"2020-06-17T15:10:51Z","modified":"2024-08-05T12:26:39Z","updated_at":"2026-11-03T02:39:27.875919Z"}],"ghsa":[{"id":"GHSA-355f-mpqr-3mwv","title":"An issue was discovered in LibVNCServer before 0.9.13. There is a memory leak in the libvncclient...","description":"An issue was discovered in LibVNCServer before 0.9.13. There is a memory leak in the libvncclient/rfbproto.c ConnectToRFBRepeater function.","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:H/I:N/A:N","level":"high"}],"cwes":["CWE-200","CWE-909"],"updated_at":"2026-11-02T14:45:13.764942Z"}],"nvd":[{"id":"CVE-2018-21247","description":"An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.","status":"published","published":"2020-06-17T16:15:11.367Z","modified":"2026-06-17T01:54:27.87Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-909"],"updated_at":"2026-11-02T14:05:00.03074Z"}],"osv":[{"id":"CVE-2018-21247","description":"An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.","status":"published","published":"2020-06-17T16:15:11.367Z","modified":"2026-10-20T10:48:03.763019216Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:09.145458Z"},{"id":"DEBIAN-CVE-2018-21247","description":"An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.","status":"published","published":"2020-06-17T16:15:11.367Z","modified":"2026-10-23T18:03:05.729187317Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:45:30.867575Z"},{"id":"RHSA-2021:1811","title":"Red Hat Security Advisory: libvncserver security update","status":"published","published":"2024-09-16T05:02:38Z","modified":"2026-06-27T10:13:34Z","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":"2026-11-02T15:53:08.071325Z"},{"id":"RLSA-2021:1811","title":"Moderate: libvncserver security update","description":"LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.\n\nSecurity Fix(es):\n\n* libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)\n\n* libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)\n\n* libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)\n\n* libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)\n\n* libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Rocky Linux 8.4 Release Notes linked from the References section.","status":"published","published":"2021-05-18T06:09:01Z","modified":"2026-02-04T10:30:04.644359Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:23.969672Z"},{"id":"UBUNTU-CVE-2018-21247","description":"An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.","status":"published","published":"2020-06-17T16:15:00Z","modified":"2026-10-17T12:55:26.615661835Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:54:17.91743Z"},{"id":"ALSA-2021:1811","title":"Moderate: libvncserver security update","description":"LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.\n\nSecurity Fix(es):\n\n* libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)\n\n* libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)\n\n* libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)\n\n* libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)\n\n* libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.","status":"published","published":"2021-05-18T06:09:01Z","modified":"2026-10-29T11:00:51.550030413Z","updated_at":"2026-11-02T15:27:51.196609Z"},{"id":"DLA-1617-1","title":"libvncserver - security update","status":"published","published":"2018-12-25T00:00:00Z","modified":"2026-03-09T01:18:03.32383Z","updated_at":"2026-11-02T15:46:09.777694Z"},{"id":"DSA-4383-1","title":"libvncserver - security update","status":"published","published":"2019-02-03T00:00:00Z","modified":"2026-03-09T02:09:27.290956Z","updated_at":"2026-11-02T15:46:16.862196Z"},{"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"}]}}