Detections
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CVE-2021-26937

critical

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.

References

https://www.debian.org/security/2021/dsa-4861

https://security.gentoo.org/glsa/202105-11

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/

https://lists.debian.org/debian-lts-announce/2021/02/msg00031.html

https://www.openwall.com/lists/oss-security/2021/02/09/3

https://security.netapp.com/advisory/ntap-20250509-0004/

https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html

https://ftp.gnu.org/gnu/screen/

http://www.openwall.com/lists/oss-security/2021/02/09/8

Details

Source: Mitre, NVD

Published: 2021-02-09

Updated: 2025-05-09

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.013