CVE-2018-16253

5.9 mediumEPSS 0.6%

Medium (5.9) in axtls project axtls. EPSS 0.6% chance of exploitation in the next 30 days.

In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification does not properly verify the ASN.1 metadata. Consequently, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation through fake X.509 certificates. This is an even more permissive variant of CVE-2006-4790 and CVE-2014-1568.

Severity

CVSS 3.0

5.9 medium

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

EPSS: 0.6% chance of exploitation in the next 30 days; higher than 49% of CVEs (scores of 2026-10-31)
CWE: CWE-347
Published: 2018-11-07
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

axtls_project:axtls

References

https://github.com/igrr/axtls-8266/commit/5efe2947ab45e81d84b5f707c51d1c64be52f36c
https://sourceforge.net/p/axtls/mailman/message/36459928/
https://github.com/igrr/axtls-8266/commit/5efe2947ab45e81d84b5f707c51d1c64be52f36c
https://sourceforge.net/p/axtls/mailman/message/36459928/

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