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TI-2021-19355 Aliases CVE-2021-43413GHSA-4gqc-53g7-25x6

An issue was discovered in GNU Hurd before 0.9 20210404-9.

Priority MEDIUM 42Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

An issue was discovered in GNU Hurd before 0.9 20210404-9. A single pager port is shared among everyone who mmaps a file, allowing anyone to modify any files that they can read. This can be trivially exploited to get full root access.

Why it matters now

EPSS 0.01973 80th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

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 · 1

CPEVersionsRoleVendor
cpe:2.3:a:gnu:hurd:*:*:*:*:*:*:*:*before 0.9.20210404-9VulnerableGNU
  • cpe:2.3:a:gnu:hurd:*:*:*:*:*:*:*:* Versions before 0.9.20210404-9 Vulnerable ·GNU

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43413
  2. 2026-10-03 Alias added: GHSA-4gqc-53g7-25x6

References

Exploit 1

Advisory 2

Other 1

  • TI-2021-19353 An issue was discovered in GNU Hurd before 0.9 20210404-9. CVSS 3.1HIGH 7.5
  • TI-2021-19354 An issue was discovered in GNU Hurd before 0.9 20210404-9. CVSS 3.1HIGH 7.8
  • TI-2021-19356 An issue was discovered in GNU Hurd before 0.9 20210404-9. CVSS 3.1HIGH 7.0

Sources

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