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Vulnerability details: VCID-c255-m7n4-4yew
Vulnerability ID VCID-c255-m7n4-4yew
Aliases CVE-2021-26937
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 8.6
Risk 4.3
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-787 Out-of-bounds Write
System Score Found at
cvssv3 9.6 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-26937.json
epss 0.12654 https://api.first.org/data/v1/epss?cve=CVE-2021-26937
epss 0.12654 https://api.first.org/data/v1/epss?cve=CVE-2021-26937
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
archlinux Medium https://security.archlinux.org/AVG-1553
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-26937.json
https://api.first.org/data/v1/epss?cve=CVE-2021-26937
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26937
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1927062 https://bugzilla.redhat.com/show_bug.cgi?id=1927062
982435 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982435
AVG-1553 https://security.archlinux.org/AVG-1553
GLSA-202105-11 https://security.gentoo.org/glsa/202105-11
RHSA-2021:0742 https://access.redhat.com/errata/RHSA-2021:0742
RHSA-2022:1074 https://access.redhat.com/errata/RHSA-2022:1074
USN-4747-1 https://usn.ubuntu.com/4747-1/
USN-4747-2 https://usn.ubuntu.com/4747-2/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-26937.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.94105
EPSS Score 0.12654
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T17:10:49.097734+00:00 Debian Importer Import https://security-tracker.debian.org/tracker/data/json 38.6.0