CVE-2021-26937

CRITICAL

GNU Screen < 4.8.0 - Denial of Service via Crafted UTF-8 Character Sequence

Title source: llm
STIX 2.1

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.

References (10)

Core 10
Core References
Exploit, Mailing List, Vendor Advisory x_refsource_misc
https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html
Exploit, Mailing List, Third Party Advisory x_refsource_misc
https://www.openwall.com/lists/oss-security/2021/02/09/3
Product x_refsource_misc
https://ftp.gnu.org/gnu/screen/
Exploit, Mailing List, Third Party Advisory mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2021/02/09/8
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/02/msg00031.html
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2021/dsa-4861
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202105-11

Scores

CVSS v3 9.8
EPSS 0.0903
EPSS Percentile 94.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-88
Status published
Products (5)
debian/debian_linux 9.0
debian/debian_linux 10.0
fedoraproject/fedora 32
fedoraproject/fedora 33
gnu/screen < 4.8.0
Published Feb 09, 2021
Tracked Since Feb 18, 2026