CVE-2023-6237 — Issue summary: Checking excessively long invalid RSA public keys may take a long

Issue summary: Checking excessively long invalid RSA public keys may take a long time.

01What is this vulnerability?

Issue summary: Checking excessively long invalid RSA public keys may take a long time.

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: 2024-04-25T07:15:45.270
• Last modified: 2026-10-14T23:17:19.220

09References

• github.com — https://github.com/openssl/openssl/commit/0b0f7abfb37350794a4b8960fafc292cd5d1b8…
• github.com — https://github.com/openssl/openssl/commit/18c02492138d1eb8b6548cb26e7b625fb2414a…
• github.com — https://github.com/openssl/openssl/commit/a830f551557d3d66a84bbb18a5b889c640c362…
• www.openssl.org — https://www.openssl.org/news/secadv/20240115.txt
• www.openwall.com — http://www.openwall.com/lists/oss-security/2024/03/11/1
• github.com — https://github.com/openssl/openssl/commit/0b0f7abfb37350794a4b8960fafc292cd5d1b8…
• github.com — https://github.com/openssl/openssl/commit/18c02492138d1eb8b6548cb26e7b625fb2414a…
• github.com — https://github.com/openssl/openssl/commit/a830f551557d3d66a84bbb18a5b889c640c362…
• security.netapp.com — https://security.netapp.com/advisory/ntap-20240531-0007/
• www.openssl.org — https://www.openssl.org/news/secadv/20240115.txt