CVE-2021-26937 is a critical denial-of-service vulnerability affecting GNU Screen versions up to 4.8.0, as well as various Debian and Fedora distributions. An unauthenticated remote attacker can exploit this flaw by sending a specially crafted UTF-8 character sequence, leading to an application crash and potentially other unspecified impacts. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with low attack complexity, posing a high risk to confidentiality, integrity, and availability. While no public exploit code or active exploitation has been observed, and community discussion is minimal, its high EPSS score suggests a non-negligible probability of future exploitation.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 4.8.0CPE matchmatch criteria | cpe:2.3:a:gnu:screen:*:*:*:*:*:*:*:* | ||
9.0CPE matchmatch criteria | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | ||
10.0CPE matchmatch criteria | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | ||
32CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | ||
33CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
screen: crash when processing combining chars
Feb 10, 2021encoding.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.
Feb 9, 2021