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TI-2018-15920 Aliases CVE-2018-1000520GHSA-fjhp-rw56-p66f

ARM mbedTLS version 2.7.0 and earlier contains a Ciphersuite Allows Incorrectly Signed…

Priority LOW 34CWE-295Published · Updated

Key facts

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

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-295.

Summary

ARM mbedTLS version 2.7.0 and earlier contains a Ciphersuite Allows Incorrectly Signed Certificates vulnerability in mbedtls_ssl_get_verify_result() that can result in ECDSA-signed certificates are accepted, when only RSA-signed ones should be.. This attack appear to be exploitable via Peers negotiate a TLS-ECDH-RSA-* ciphersuite. Any of the peers can then provide an ECDSA-signed certificate, when only an RSA-signed one should be accepted..

Why it matters now

EPSS 0.00786 56th 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:*:*:*:*:*:*:*:*up to 2.7.0VulnerableArm
  • cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* Versions up to 2.7.0 Vulnerable ·Arm

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-1000520
  2. 2026-10-03 Alias added: GHSA-fjhp-rw56-p66f

References

Advisory 1

  • 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