{"id":"CVE-2021-26937","aliases":["ALPINE-CVE-2021-26937","AZL-7356","BELL-CVE-2021-26937","CLSA-2021-1618497131","CLSA-2021-1634925515","DEBIAN-CVE-2021-26937","DLA-2570-1","DSA-4861-1","EUVD-2021-13719","GHSA-pjrj-fmxp-cmc4","MGASA-2021-0109","OESA-2021-1090","RHSA-2021:0742","RHSA-2022:1074","SUSE-SU-2021:0491-1","SUSE-SU-2021:0492-1","UBUNTU-CVE-2021-26937","USN-4747-1","USN-4747-2","openSUSE-SU-2021:0304-1","openSUSE-SU-2024:11884-1"],"status":"published","title":"encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service ...","description":"encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character 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Advisory","advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20250509-0004/","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26937","tags":["web","advisory"]},{"url":"https://ftp.gnu.org/gnu/screen"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM"},{"url":"https://security.netapp.com/advisory/ntap-20250509-0004"},{"url":"https://github.com/advisories/GHSA-pjrj-fmxp-cmc4"},{"url":"https://security.alpinelinux.org/vuln/CVE-2021-26937","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2021-26937","tags":["advisory"]},{"url":"https://errata.cloudlinux.com/els6/CLSA-2021-1618497131.html","tags":["advisory"]},{"url":"https://errata.cloudlinux.com/ol6/CLSA-2021-1634925515.html","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-26937","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2021-0109.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=28390","tags":["report"]},{"url":"https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1090","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:0742","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#important","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1927062","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_0742.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-26937","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-26937","tags":["advisory","report"]},{"url":"https://access.redhat.com/errata/RHSA-2022:1074","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2022/rhsa-2022_1074.json","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2021/suse-su-20210491-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1182092","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2021-26937","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2021/suse-su-20210492-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-26937","tags":["report"]},{"url":"https://seclists.org/oss-sec/2021/q1/124","tags":["report"]},{"url":"https://seclists.org/oss-sec/2021/q1/129","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4747-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-4747-2","tags":["advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/AYNLKAL7KI2RT6BUJQ25AIHB4Q2CRI2D/","tags":["advisory"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2021-26937","description":"encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.","status":"published","published":"2021-02-09T19:35:50Z","modified":"2025-05-09T20:03:29.289Z","updated_at":"2026-11-02T14:32:57.368269Z"}],"euvd":[{"id":"EUVD-2021-13719","description":"encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.","status":"published","published":"2021-02-09T19:35:50Z","modified":"2025-05-09T20:03:29Z","cvss":[{"version":"","score":0,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"none"}],"updated_at":"2026-11-02T20:32:50.201515Z"}],"ghsa":[{"id":"GHSA-pjrj-fmxp-cmc4","title":"encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service ...","description":"encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.","status":"published","published":"2022-05-24T17:41:39Z","modified":"2025-05-09T21:31:56Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T15:02:13.681205Z"}],"nvd":[{"id":"CVE-2021-26937","description":"encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.","status":"published","published":"2021-02-09T20:15:14.91Z","modified":"2026-06-17T03:44:02.737Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T14:06:50.031227Z"}],"osv":[{"id":"ALPINE-CVE-2021-26937","description":"encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.","status":"published","published":"2021-02-09T20:15:14.91Z","modified":"2026-10-23T17:17:56.164319601Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:27:48.646074Z"},{"id":"AZL-7356","title":"CVE-2021-26937 affecting package screen for versions less than 4.9.1-1","description":"encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.","status":"published","published":"2021-02-09T20:15:14Z","modified":"2026-04-21T04:33:56.198343Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:28:09.201912Z"},{"id":"BELL-CVE-2021-26937","title":"CVE-2021-26937 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:14:01.529796Z","modified":"2026-01-26T09:45:54.90018Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:28:15.925958Z"},{"id":"CVE-2021-26937","description":"encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.","status":"published","published":"2021-02-09T20:15:14.91Z","modified":"2026-04-16T04:37:47.948580145Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:18.778776Z"},{"id":"DEBIAN-CVE-2021-26937","description":"encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.","status":"published","published":"2021-02-09T20:15:14.91Z","modified":"2026-10-23T18:03:25.411860767Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:45:34.637046Z"},{"id":"OESA-2021-1090","title":"screen security update","description":"Screen is a full-screen window manager that multiplexes a physical terminal between several processes, typically interactive shells. \r\n\r\nSecurity Fix(es):\r\n\r\nencoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.(CVE-2021-26937)","status":"published","published":"2021-03-26T11:04:19Z","modified":"2026-08-18T01:15:18.794987863Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:52:38.987987Z"},{"id":"RHSA-2021:0742","title":"Red Hat Security Advisory: screen security update","status":"published","published":"2024-09-16T05:28:14Z","modified":"2026-06-26T10:53:18Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:53:08.071325Z"},{"id":"RHSA-2022:1074","title":"Red Hat Security Advisory: screen security update","status":"published","published":"2024-09-16T05:28:21Z","modified":"2025-11-22T12:31:48Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:53:09.077222Z"},{"id":"UBUNTU-CVE-2021-26937","description":"encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.","status":"published","published":"2021-02-09T20:15:00Z","modified":"2026-02-04T02:57:32.3439Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:54:26.779273Z"},{"id":"CLSA-2021-1618497131","title":"Fix of CVE: CVE-2021-26937","description":"- fix CVE-2021-26937","status":"published","published":"2021-04-15T14:32:11Z","modified":"2026-06-01T00:33:14.986829268Z","updated_at":"2026-11-02T15:43:39.801198Z"},{"id":"CLSA-2021-1634925515","title":"Fixed CVE-2021-26937 in screen","description":"- fix CVE-2021-26937","status":"published","published":"2021-10-22T17:58:35Z","modified":"2026-06-01T00:31:42.274317791Z","updated_at":"2026-11-02T15:43:39.801198Z"},{"id":"DLA-2570-1","title":"screen - security update","status":"published","published":"2021-02-20T00:00:00Z","modified":"2026-03-09T01:21:25.219267Z","updated_at":"2026-11-02T15:46:10.712745Z"},{"id":"DSA-4861-1","title":"screen - security update","status":"published","published":"2021-02-21T00:00:00Z","modified":"2026-03-09T02:11:41.584794Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"MGASA-2021-0109","title":"Updated screen packages fix security vulnerability","description":"Felix Weinmann reported a flaw in the handling of combining characters in\nscreen, which can result in denial of service, or potentially the execution of\narbitrary code via a specially crafted UTF-8 character sequence\n(CVE-2021-26937).\n","status":"published","published":"2021-03-04T16:53:32Z","modified":"2026-04-16T04:42:43.237463228Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"openSUSE-SU-2021:0304-1","title":"Security update for screen","description":"This update for screen fixes the following issues:\n\n- CVE-2021-26937: Fixed double width combining char handling that could lead to a denial of service or code execution (bsc#1182092).\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2021-02-18T06:52:16Z","modified":"2026-02-04T03:42:38.825363Z","updated_at":"2026-11-02T16:58:31.879684Z"},{"id":"openSUSE-SU-2024:11884-1","title":"screen-4.9.0-1.1 on GA media","description":"These are all security issues fixed in the screen-4.9.0-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T02:52:31.731473Z","updated_at":"2026-11-02T16:58:35.485255Z"},{"id":"SUSE-SU-2021:0491-1","title":"Security update for screen","description":"This update for screen fixes the following issues:\n\n- CVE-2021-26937: Fixed double width combining char handling that could lead to a denial of service or code execution (bsc#1182092).\n","status":"published","published":"2021-02-17T07:38:28Z","modified":"2026-02-04T03:53:13.967129Z","updated_at":"2026-11-02T15:53:48.690034Z"},{"id":"SUSE-SU-2021:0492-1","title":"Security update for screen","description":"This update for screen fixes the following issues:\n\n- CVE-2021-26937: Fixed double width combining char handling that could lead to a denial of service or code execution (bsc#1182092).\n","status":"published","published":"2021-02-17T08:40:46Z","modified":"2025-05-02T04:10:36.15032Z","updated_at":"2026-11-02T15:53:48.690034Z"},{"id":"USN-4747-1","title":"screen vulnerability","description":"Felix Weinmann discovered that GNU Screen incorrectly handled certain\ncharacter sequences. A remote attacker could use this issue to cause GNU\nScreen to crash, resulting in a denial of service, or possibly execute\narbitrary code.\n","status":"published","published":"2021-02-24T13:58:42Z","modified":"2026-02-10T04:42:03Z","updated_at":"2026-11-02T16:58:15.159055Z"},{"id":"USN-4747-2","title":"screen vulnerability","description":"USN-4747-1 fixed a vulnerability in screen. This update provides\nthe corresponding update for Ubuntu 14.04 ESM.\n\nOriginal advisory details:\n\n Felix Weinmann discovered that GNU Screen incorrectly handled certain\n character sequences. A remote attacker could use this issue to cause GNU\n Screen to crash, resulting in a denial of service, or possibly execute\n arbitrary code.\n","status":"published","published":"2021-02-24T19:56:30Z","modified":"2026-02-10T04:42:03Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}