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TI-2021-18313 Aliases CVE-2021-41581GHSA-675w-hmxx-cvf3

x509_constraints_parse_mailbox in lib/libcrypto/x509/x509_constraints.c in LibreSSL…

Priority LOW 26CWE-125Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

x509_constraints_parse_mailbox in lib/libcrypto/x509/x509_constraints.c in LibreSSL through 3.4.0 has a stack-based buffer over-read. When the input exceeds DOMAIN_PART_MAX_LEN, the buffer lacks '\0' termination.

Why it matters now

EPSS 0.00646 51st percentileScored 2026-11-08
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:openbsd:libressl:*:*:*:*:*:*:*:*up to 3.4.0VulnerableOpenBSD
  • cpe:2.3:a:openbsd:libressl:*:*:*:*:*:*:*:* Versions up to 3.4.0 Vulnerable ·OpenBSD

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-41581
  2. 2026-10-03 Alias added: GHSA-675w-hmxx-cvf3
  3. 2026-10-20 EPSS moved to the 50th–90th percentile

References

Exploit 1

  • TI-2023-17874 A double free or use after free could occur after SSL_clear in OpenBSD 7.2 before errata… CVSS 3.1CRITICAL 9.8
  • TI-2021-21548 x509/x509_verify.c in LibreSSL before 3.4.2, and OpenBSD before 7.0 errata 006, allows… CVSS 3.1CRITICAL 9.8
  • TI-2015-04488 Out-of-bounds write in LibreSSL CVSS 3.1CRITICAL 9.8
  • TI-2015-04487 Uncontrolled resource consumption in LibreSSL CVSS 3.1HIGH 7.5
  • TI-2014-07651 Double free vulnerability in the ssl_parse_clienthello_use_srtp_ext function in d1_srtp.c… CVSS 2.0HIGH 7.5
  • TI-2018-06502 The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0… CVSS 3.0HIGH 7.4
See all 11 →

Sources

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