CVE-2021-27135
9.8
CRITICAL · CVSS 3.1 · EPSS 7.8% (pctl 95)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
Description
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 7.84% — more likely to be exploited than 95% of all CVEs |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2021-02-10 |
| Last modified | 2026-06-17 |
Affected (3)
| Vendor | Product |
|---|---|
| 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
- https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea340ba7075c
- https://invisible-island.net/xterm/xterm.log.html
- https://lists.debian.org/debian-lts-announce/2021/02/msg00019.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/35LK2ZXEIJUOGOA7FV2TJL3L6LFJ4X5S/
- https://news.ycombinator.com/item?id=26524650
- https://security.gentoo.org/glsa/202208-22
- https://www.openwall.com/lists/oss-security/2021/02/09/7
- https://www.openwall.com/lists/oss-security/2021/02/09/9
- 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
- https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea340ba7075c
- https://invisible-island.net/xterm/xterm.log.html
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