Read the docs
TI-2020-18725 Aliases CVE-2020-36477GHSA-qfcq-wvh3-6p75

An issue was discovered in Mbed TLS before 2.24.0.

Priority LOW 28CWE-295Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-295.

Summary

An issue was discovered in Mbed TLS before 2.24.0. The verification of X.509 certificates when matching the expected common name (the cn argument of mbedtls_x509_crt_verify) with the actual certificate name is mishandled: when the subjecAltName extension is present, the expected name is compared to any name in that extension regardless of its type. This means that an attacker could impersonate a 4-byte or 16-byte domain by getting a certificate for the corresponding IPv4 or IPv6 address (this would require the attacker to control that IP address, though).

Why it matters now

EPSS 0.00862 58th percentileScored 2026-11-07
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:arm:mbed_tls:*:*:*:*:*:*:*:*before 2.24.0VulnerableArm
  • cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* Versions before 2.24.0 Vulnerable ·Arm

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-36477
  2. 2026-10-03 Alias added: GHSA-qfcq-wvh3-6p75

References

Advisory 3

  • TI-2023-28736 An issue was discovered in Mbed TLS through 3.5.1. CVSS 3.1HIGH 7.5
  • TI-2021-19505 A Denial of Service vulnerability exists in mbed TLS 3.0.0 and earlier in the… CVSS 3.1HIGH 7.5
  • TI-2025-32620 Mbed TLS before 3.6.4 has a race condition in AESNI detection if certain compiler… CVSS 3.1HIGH 7.8
  • TI-2022-22925 An issue was discovered in Mbed TLS before 2.28.2 and 3.x before 3.3.0. CVSS 3.1CRITICAL 9.8
  • TI-2018-00445 Out-of-bounds write in ARM mbed TLS before 1.3.22, before 2.1.10, and before 2.7.0 CVSS 3.0CRITICAL 9.8
  • TI-2026-27113 An issue was discovered in Mbed TLS versions from 2.19.0 up to 3.6.5, Mbed TLS 4.0.0. CVSS 3.1CRITICAL 9.8
See all 50 →

Sources

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