CVE-2021-26937
GNU Screen UTF-8 Encoding 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.
INFO
Published Date :
Feb. 9, 2021, 8:15 p.m.
Last Modified :
May 9, 2025, 8:15 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.9
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2021-26937 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-26937
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-26937.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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openwrt
Makefile Awk Shell C Assembly C++ M4 CMake Perl Lex
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-26937 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-26937 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
May. 09, 2025
Action Type Old Value New Value Added Reference https://security.netapp.com/advisory/ntap-20250509-0004/ -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2021/02/09/8 Added Reference https://ftp.gnu.org/gnu/screen/ Added Reference https://lists.debian.org/debian-lts-announce/2021/02/msg00031.html Added Reference https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/ Added Reference https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/ Added Reference https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html Added Reference https://security.gentoo.org/glsa/202105-11 Added Reference https://www.debian.org/security/2021/dsa-4861 Added Reference https://www.openwall.com/lists/oss-security/2021/02/09/3 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/ [No types assigned] Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/ [No types assigned] Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/ Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/ -
Modified Analysis by [email protected]
May. 06, 2022
Action Type Old Value New Value Changed Reference Type https://security.gentoo.org/glsa/202105-11 No Types Assigned https://security.gentoo.org/glsa/202105-11 Third Party Advisory -
CVE Modified by [email protected]
May. 26, 2021
Action Type Old Value New Value Added Reference https://security.gentoo.org/glsa/202105-11 [No Types Assigned] -
Modified Analysis by [email protected]
Mar. 15, 2021
Action Type Old Value New Value Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/ Mailing List, Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Mar. 04, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/ [No Types Assigned] -
CVE Modified by [email protected]
Mar. 04, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/ [No Types Assigned] -
Modified Analysis by [email protected]
Feb. 24, 2021
Action Type Old Value New Value Changed Reference Type http://www.openwall.com/lists/oss-security/2021/02/09/8 Exploit, Third Party Advisory http://www.openwall.com/lists/oss-security/2021/02/09/8 Exploit, Mailing List, Third Party Advisory Changed Reference Type https://lists.debian.org/debian-lts-announce/2021/02/msg00031.html No Types Assigned https://lists.debian.org/debian-lts-announce/2021/02/msg00031.html Mailing List, Third Party Advisory Changed Reference Type https://www.debian.org/security/2021/dsa-4861 No Types Assigned https://www.debian.org/security/2021/dsa-4861 Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Feb. 22, 2021
Action Type Old Value New Value Added Reference https://www.debian.org/security/2021/dsa-4861 [No Types Assigned] -
CVE Modified by [email protected]
Feb. 19, 2021
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2021/02/msg00031.html [No Types Assigned] -
Initial Analysis by [email protected]
Feb. 17, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type http://www.openwall.com/lists/oss-security/2021/02/09/8 No Types Assigned http://www.openwall.com/lists/oss-security/2021/02/09/8 Exploit, Third Party Advisory Changed Reference Type https://ftp.gnu.org/gnu/screen/ No Types Assigned https://ftp.gnu.org/gnu/screen/ Product Changed Reference Type https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html No Types Assigned https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html Exploit, Mailing List, Vendor Advisory Changed Reference Type https://www.openwall.com/lists/oss-security/2021/02/09/3 No Types Assigned https://www.openwall.com/lists/oss-security/2021/02/09/3 Exploit, Mailing List, Third Party Advisory Added CWE NIST CWE-88 Added CPE Configuration OR *cpe:2.3:a:gnu:screen:*:*:*:*:*:*:*:* versions up to (including) 4.8.0 -
CVE Modified by [email protected]
Feb. 10, 2021
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2021/02/09/8 [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-26937 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-26937
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
1.47 }} 0.02%
score
0.79930
percentile