CVE-2021-26937
CriticalPublic PoC
Published: 09 February 2021
Published
09 February 2021
Modified
09 May 2025
KEV Added
—
Patch
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CVSS Score v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score
0.1265
94.1th percentile
Risk Priority
27
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-26937 is a critical-severity Argument Injection (CWE-88) vulnerability in Debian Debian Linux. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 5.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-13719
Vulnerability details
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.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
gnu
screen
≤ 4.8.0
debian
debian linux
10.0, 9.0
fedoraproject
fedora
32, 33
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.