CVE-2021-27135

moderate-risk
Published 2021-02-10

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.

Do I need to act?

~
1.8% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
+
Fix available
Upgrade to: a8fc74f3bcca38d5a288c9947f3e9d48868a3a3f, 82ba55b8f994ab30ff561a347b82ea340ba7075c
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (3)

Xterm

Affected Vendors

Debian Invisible-Island Fedoraproject

References (26)

Mailing List http://seclists.org/fulldisclosure/2021/May/52
Mailing List http://www.openwall.com/lists/oss-security/2021/02/10/7
Third Party Advisory https://access.redhat.com/security/cve/CVE-2021-27135
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1927559
Issue Tracking https://bugzilla.suse.com/show_bug.cgi?id=1182091
Patch https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347...
Release Notes https://invisible-island.net/xterm/xterm.log.html
Mailing List https://lists.debian.org/debian-lts-announce/2021/02/msg00019.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Issue Tracking https://news.ycombinator.com/item?id=26524650
Third Party Advisory https://security.gentoo.org/glsa/202208-22
Mailing List https://www.openwall.com/lists/oss-security/2021/02/09/7
Mailing List https://www.openwall.com/lists/oss-security/2021/02/09/9
Mailing List http://seclists.org/fulldisclosure/2021/May/52
Mailing List http://www.openwall.com/lists/oss-security/2021/02/10/7
Third Party Advisory https://access.redhat.com/security/cve/CVE-2021-27135
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1927559
Issue Tracking https://bugzilla.suse.com/show_bug.cgi?id=1182091
Patch https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347...
Release Notes https://invisible-island.net/xterm/xterm.log.html
and 6 more references
46
/ 100
moderate-risk
Severity 32/34 · Critical
Exploitability 5/34 · Minimal
Exposure 9/34 · Low