CVE-2023-45802
Apache HTTP Server: HTTP/2 stream memory not reclaimed right away on RST
- Published
- Updated
- Reserved
- Assigned by
- apache
Description
When a HTTP/2 stream was reset (RST frame) by a client, there was a time window were the request's memory resources were not reclaimed immediately. Instead, de-allocation was deferred to connection close. A client could send new requests and resets, keeping the connection busy and open and causing the memory footprint to keep on growing. On connection close, all resources were reclaimed, but the process might run out of memory before that. This was found by the reporter during testing of CVE-2023-44487 (HTTP/2 Rapid Reset Exploit) with their own test client. During "normal" HTTP/2 use, the probability to hit this bug is very low. The kept memory would not become noticeable before the connection closes or times out. Users are recommended to upgrade to version 2.4.58, which fixes the issue.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 3.2% · top 12% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Weakness
Affected products
Apache Software Foundation · Apache HTTP Server
- affected 2.4.17 – ≤ 2.4.57
References (6)
- https://httpd.apache.org/security/vulnerabilities_24.html (opens in a new tab)vendor-advisoryx_transferred
- https://lists.fedoraproject.org/archives/list/[email protected]/message/BFQD3KUEMFBHPAPBGLWQC34L4OWL5HAZ/ (opens in a new tab)x_transferred
- https://security.netapp.com/advisory/ntap-20231027-0011/ (opens in a new tab)x_transferred
- https://lists.fedoraproject.org/archives/list/[email protected]/message/2MBEPPC36UBVOZZNAXFHKLFGSLCMN5LI/ (opens in a new tab)x_transferred
- https://lists.fedoraproject.org/archives/list/[email protected]/message/WE2I52RHNNU42PX6NZ2RBUHSFFJ2LVZX/ (opens in a new tab)x_transferred
- https://lists.debian.org/debian-lts-announce/2024/05/msg00013.html (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-45802)Record last updated .