CVE-2023-35945
A public proof of concept exists; no exploitation attested.
- Published2023-07-13
- Fixed in1.26.3 · 1.25.8 · 1.24.9 · 1.23.11
- WeaknessCWE-400 · CWE-459
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Envoy is a cloud-native high-performance edge/middle/service proxy. Envoy’s HTTP/2 codec may leak a header map and bookkeeping structures upon receiving `RST_STREAM` immediately followed by the `GOAWAY` frames from an upstream server. In nghttp2, cleanup of pending requests due to receipt of the `GOAWAY` frame skips de-allocation of the bookkeeping structure and pending compressed header. The error return [code path] is taken if connection is already marked for not sending more requests due to `GOAWAY` frame. The clean-up code is right after the return statement, causing memory leak. Denial of service through memory exhaustion. This vulnerability was patched in versions(s) 1.26.3, 1.25.8, 1.24.9, 1.23.11.
Timeline
dates in UTC- 2023-07-1321:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-35945?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-35945?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 1.26 | ≥ 1.26.0, < 1.26.3 | 1.26.3 | NVD |
| 1.25 | ≥ 1.25.0, < 1.25.8 | 1.25.8 | NVD |
| 1.24 | ≥ 1.24.0, < 1.24.9 | 1.24.9 | NVD |
| 1.23 | < 1.23.11 | 1.23.11 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 1.55 | < 1.55.1 | 1.55.1 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Envoy to 1.26.3 · 1.25.8 · 1.24.9 · 1.23.11
Advisories and patches
- github.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2023-07-13
- Last Modified
- 2026-10-15
- NVD status
- Modified
Frequently asked questions
What is CVE-2023-35945?
Is CVE-2023-35945 actively exploited?
What is the CVSS score for CVE-2023-35945?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.