CVE-2023-0465 — Applications that use a non-default option when verifying certificates may be vu

Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks.

01What is this vulnerability?

Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-03-28T15:15:06.820
• Last modified: 2026-10-14T20:17:23.747

09References

• git.openssl.org — https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=10325176f3d3e98c6e2…
• git.openssl.org — https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=1dd43e0709fece299b1…
• git.openssl.org — https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=b013765abfa80036dc7…
• git.openssl.org — https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=facfb1ab745646e97a1…
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2023/06/msg00011.html
• security.gentoo.org — https://security.gentoo.org/glsa/202402-08
• security.netapp.com — https://security.netapp.com/advisory/ntap-20230414-0001/
• www.debian.org — https://www.debian.org/security/2023/dsa-5417
• www.openssl.org — https://www.openssl.org/news/secadv/20230328.txt
• git.openssl.org — https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=10325176f3d3e98c6e2…