CVE-2024-36387 — Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a N

Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference, leading to a crash of the server process, degrading performance.

01What is this vulnerability?

Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference, leading to a crash of the server process, degrading performance.

02Affected products

Vendor	Product	Versions
Apache Software Foundation	Apache HTTP Server	2.4.55

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

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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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: 2024-07-01T18:10:25.512Z
• Last modified: 2025-02-13T17:52:53.571Z

09References

• httpd.apache.org — https://httpd.apache.org/security/vulnerabilities_24.html
• security.netapp.com — https://security.netapp.com/advisory/ntap-20240712-0001/