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TI-2021-08683 Aliases CVE-2021-27135GHSA-3w4p-5chr-2r8f

xterm before Patch #366 allows remote attackers to execute arbitrary code or cause a…

Priority MEDIUM 53Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 6 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

EPSS 0.08178 94th percentileScored 2026-11-07
Fix Partial Red Hat: 4 advisoriesRed Hat: 6 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:invisible-island:xterm:*:*:*:*:*:*:*:*before 366VulnerableInvisible-island
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*33VulnerableFedoraproject
  • cpe:2.3:a:invisible-island:xterm:*:*:*:*:*:*:*:* Versions before 366 Vulnerable ·Invisible-island
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject

Remediation

Red Hat 4 advisories

  • RHSA-2021:0651 Released 2021-02-24 · Red Hat rating Important
    xterm security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.2) xterm-331-1.el8_2.1, xterm-resize-331-1.el8_2.1
  • RHSA-2021:0650 Released 2021-02-24 · Red Hat rating Important
    xterm security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.1) xterm-331-1.el8_1.1, xterm-resize-331-1.el8_1.1
  • RHSA-2021:0617 Released 2021-02-22 · Red Hat rating Important
    xterm security update
    • Red Hat Enterprise Linux Client (v. 7) xterm-295-3.el7_9.1
    • Red Hat Enterprise Linux Server (v. 7) xterm-295-3.el7_9.1
    • Red Hat Enterprise Linux Workstation (v. 7) xterm-295-3.el7_9.1
Show 1 more Red Hat advisories
  • RHSA-2021:0611 Released 2021-02-18 · Red Hat rating Important
    xterm security update
    • Red Hat Enterprise Linux AppStream (v. 8) xterm-331-1.el8_3.2, xterm-resize-331-1.el8_3.2

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:0611
Red Hat Enterprise Linux AppStream EUS (v. 8.1)Fixed RHSA-2021:0650
Red Hat Enterprise Linux AppStream EUS (v. 8.2)Fixed RHSA-2021:0651
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2021:0617
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2021:0617
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:0617
Not affected: 1 product
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-27135
  2. 2026-10-03 Alias added: GHSA-3w4p-5chr-2r8f

References

Patch 1

Advisory 10

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences