# OpenSSL X.509 certificate verification buffer overflow enables DoS or remote code…

Published: 2022-11-01 · Severity: critical
Canonical: https://vorant.io/reports/0c28b282-359b-4af9-8024-fc2b50c2d185/openssl-x-509-certificate-verification-buffer-overflow-enables-dos-or-remote

> OpenSSL X.509 certificate verification buffer overflow enables DoS or remote code execution via malicious certificates; update to patched versions immediately.

The Information-technology Promotion Agency (IPA) of Japan has issued an advisory concerning a buffer overflow vulnerability in OpenSSL's X.509 certificate verification process. The flaw affects OpenSSL 3.x versions but does not impact the 1.1.1 or 1.0.2 release branches. Exploitation requires an attacker to present a malicious X.509 certificate to a vulnerable system, triggering the overflow condition during verification.

Successful exploitation may result in denial of service or remote code execution, presenting significant risk to systems performing certificate validation. The vendor has released patched versions addressing this vulnerability. Given OpenSSL's ubiquity in TLS/SSL implementations across enterprise infrastructure, web servers, VPNs, and embedded systems, the potential attack surface is substantial.

Organizations should prioritize identifying OpenSSL 3.x deployments and apply vendor-supplied updates immediately. The advisory emphasizes urgency due to the likelihood of expanded exploitation as proof-of-concept code emerges and threat actors incorporate the technique into operational toolkits.

## Mentioned in this report

- Vulnerabilities: CVE-2022-3602, CVE-2022-3786

Source reporting: https://www.ipa.go.jp/archive/security/security-alert/2022/alert20221102.html

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