CVE-2021-27135

9.8 criticalEPSS 7.8%

Critical (9.8). EPSS 7.8% chance of exploitation in the next 30 days.

xterm before Patch #366 allows remote attackers to execute arbitrary code or cause a denial of service (segmentation fault) via a crafted UTF-8 combining character sequence.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 7.8% chance of exploitation in the next 30 days; higher than 94% of CVEs (scores of 2026-10-31)
Published: 2021-02-10
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

debian:debian_linux
fedoraproject:fedora
invisible-island:xterm

References

http://seclists.org/fulldisclosure/2021/May/52
http://www.openwall.com/lists/oss-security/2021/02/10/7
https://access.redhat.com/security/cve/CVE-2021-27135
https://bugzilla.redhat.com/show_bug.cgi?id=1927559
https://bugzilla.suse.com/show_bug.cgi?id=1182091

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