VULNERABILITY INTELLIGENCE

CVE-2018-16149

CVSS score5.9 MEDIUM

EPSS probability0.70%

CISA KEVNot currently listed

Published2018-11-07

Last modified2026-06-17

CVSS vectorCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification blindly trusts the declared lengths in the ASN.1 structure. Consequently, when small public exponents are being used, a remote attacker can generate purposefully crafted signatures (and put them on X.509 certificates) to induce illegal memory access and crash the verifier.

Weakness classification

CWE-347: Improper Verification of Cryptographic Signature

Primary references

cve@mitre.org — Patch, Third Party Advisory
cve@mitre.org — Exploit, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Patch, Third Party Advisory