Critical severity9.8NVD Advisory· Published Feb 9, 2021· Updated Jun 17, 2026

CVE-2021-26937

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

GNU/Screen2 versions
cpe:2.3:a:gnu:screen:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:gnu:screen:*:*:*:*:*:*:*:*range: <=4.8.0
- (no CPE)range: <=4.8.0
Debian/linux2 versions
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
Fedoraproject/Fedora2 versions
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
GNU Screen/GNU Screendescription
osv-coords32 versions
pkg:rpm/opensuse/screen&distro=openSUSE%20Leap%2015.2 pkg:rpm/opensuse/screen&distro=openSUSE%20Tumbleweed pkg:rpm/suse/screen&distro=HPE%20Helion%20OpenStack%208 pkg:rpm/suse/screen&distro=SUSE%20Enterprise%20Storage%206 pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOS pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSS pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOS pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSS pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2 pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCL pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSS pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCL pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSS pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSS pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5 pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCL pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSS pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSS pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2 pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3 pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4 pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5 pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015 pkg:rpm/suse/screen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1 pkg:rpm/suse/screen&distro=SUSE%20Manager%20Proxy%204.0 pkg:rpm/suse/screen&distro=SUSE%20Manager%20Retail%20Branch%20Server%204.0 pkg:rpm/suse/screen&distro=SUSE%20Manager%20Server%204.0 pkg:rpm/suse/screen&distro=SUSE%20OpenStack%20Cloud%207 pkg:rpm/suse/screen&distro=SUSE%20OpenStack%20Cloud%208 pkg:rpm/suse/screen&distro=SUSE%20OpenStack%20Cloud%209 pkg:rpm/suse/screen&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208 pkg:rpm/suse/screen&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209
< 4.6.2-lp152.6.3.1+ 31 more
- (no CPE)range: < 4.6.2-lp152.6.3.1
- (no CPE)range: < 4.9.0-1.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.6.2-5.3.1
- (no CPE)range: < 4.6.2-5.3.1
- (no CPE)range: < 4.6.2-5.3.1
- (no CPE)range: < 4.6.2-5.3.1
- (no CPE)range: < 4.6.2-5.3.1
- (no CPE)range: < 4.6.2-5.3.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.6.2-5.3.1
- (no CPE)range: < 4.6.2-5.3.1
- (no CPE)range: < 4.6.2-5.3.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.6.2-5.3.1
- (no CPE)range: < 4.6.2-5.3.1
- (no CPE)range: < 4.6.2-5.3.1
- (no CPE)range: < 4.6.2-5.3.1
- (no CPE)range: < 4.6.2-5.3.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.0.4-23.6.1
- (no CPE)range: < 4.0.4-23.6.1

Patches

Vulnerability mechanics

References

www.openwall.com/lists/oss-security/2021/02/09/8nvdExploitMailing ListThird Party Advisory
lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.htmlnvdExploitMailing ListVendor Advisory
www.openwall.com/lists/oss-security/2021/02/09/3nvdExploitMailing ListThird Party Advisory
lists.debian.org/debian-lts-announce/2021/02/msg00031.htmlnvdMailing ListThird Party Advisory
security.gentoo.org/glsa/202105-11nvdThird Party Advisory
www.debian.org/security/2021/dsa-4861nvdThird Party Advisory
ftp.gnu.org/gnu/screen/nvdProduct
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/nvd
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/nvd
security.netapp.com/advisory/ntap-20250509-0004/nvd

News mentions

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cvss	0.637
epss	0.007
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000