CVE-2021-27135
CRITICAL
9.8
CVSS Score
Published: February 10, 2021 at 03:51 PM UTC
Updated: June 17, 2026 at 03:44 AM UTC
3 products affected across 3 vendorsDebian LinuxFedoraXterm
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Severity
CRITICAL9.8
Exploit prediction
EPSS 8%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Debian Linux· Debiandrupal
95%95%
v < 366
Affected range stops below 366, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea340ba7075c
- https://invisible-island.net/xterm/xterm.log.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/35LK2ZXEIJUOGOA7FV2TJL3L6LFJ4X5S/
- https://security.gentoo.org/glsa/202208-22
References (13)
Mailing Listx_refsource_FULLDISCThird Party Advisory
Source: [email protected]
http://seclists.org/fulldisclosure/2021/May/52Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
http://www.openwall.com/lists/oss-security/2021/02/10/7x_refsource_MISCThird Party Advisory
Source: [email protected]
https://access.redhat.com/security/cve/CVE-2021-27135x_refsource_MISCIssue Tracking
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=1927559x_refsource_CONFIRMIssue Tracking
Source: [email protected]
https://bugzilla.suse.com/show_bug.cgi?id=1182091x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea340ba7075cx_refsource_CONFIRMRelease NotesVendor Advisory
Source: [email protected]
https://invisible-island.net/xterm/xterm.log.htmlMailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2021/02/msg00019.htmlCVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
NVD-CWE-noinfo
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