Vulnerability in GNU Screen
CVE-2021-26937
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.091 (95.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.091 · newest: 0.091 · change: 0.000
Affected products
- GNU Screen
- Debian Linux — versions 9.0, 10.0
- Fedoraproject Fedora — versions 32, 33
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html (Exploit, Mailing List, Vendor Advisory)
- www.openwall.com/lists/oss-security/2021/02/09/3 (Exploit, Mailing List, Third Party Advisory)
- ftp.gnu.org/gnu/screen/ (Product)
- www.openwall.com/lists/oss-security/2021/02/09/8 (mailing-list, Exploit, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/02/msg00031.html (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2021/dsa-4861 (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.gentoo.org/glsa/202105-11 (vendor-advisory, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2021-26937?
- CVE-2021-26937 is a critical-severity vulnerability in GNU Screen, classified under Argument Injection. CVSS score: 9.8/10. Published 2021-02-09.
- How severe is CVE-2021-26937?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-26937 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.