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.
Argument Injection
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
mitreCNA
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 93%
VendorProductVersion
gnuscreen
𝑥
≤ 4.8.0
debiandebian_linux
9.0
debiandebian_linux
10.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
screen
bullseye
4.8.0-6
fixed
bookworm
4.9.0-4
fixed
sid
4.9.1-1
fixed
trixie
4.9.1-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
screen
hirsute
not-affected
groovy
Fixed 4.8.0-2ubuntu0.1
released
focal
Fixed 4.8.0-1ubuntu0.1
released
bionic
Fixed 4.6.2-1ubuntu1.1
released
xenial
Fixed 4.3.1-2ubuntu0.1
released
trusty
Fixed 4.1.0~20120320gitdb59704-9ubuntu0.1~esm2
released
Common Weakness Enumeration
References
http://www.openwall.com/lists/oss-security/2021/02/09/8
https://ftp.gnu.org/gnu/screen/
https://lists.debian.org/debian-lts-announce/2021/02/msg00031.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/
https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html
https://security.gentoo.org/glsa/202105-11
https://www.debian.org/security/2021/dsa-4861
https://www.openwall.com/lists/oss-security/2021/02/09/3
http://www.openwall.com/lists/oss-security/2021/02/09/8
https://ftp.gnu.org/gnu/screen/
https://lists.debian.org/debian-lts-announce/2021/02/msg00031.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/
https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html
https://security.gentoo.org/glsa/202105-11
https://security.netapp.com/advisory/ntap-20250509-0004/
https://www.debian.org/security/2021/dsa-4861
https://www.openwall.com/lists/oss-security/2021/02/09/3