CVE-2023-35945
Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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.
A flaw was found in Envoy, where a specifically crafted response from an untrusted upstream service can cause a denial of service through memory exhaustion. This issue is caused by Envoy’s HTTP/2 codec, which may leak a header map and bookkeeping structures upon receiving RST_STREAM immediately, followed by the GOAWAY frames from an upstream server.
Red Hat OpenShift Service Mesh is Red Hat's distribution of the Istio service mesh project, tailored for installation into an on-premise OpenShift Container Platform installation. Issues addressed include a memory leak vulnerability.
CVSS Scores
SSVC
- Decision:Attend
Timeline
- 2023-06-20 CVE Reserved
- 2023-07-13 CVE Published
- 2024-10-31 CVE Updated
- 2025-03-30 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-400: Uncontrolled Resource Consumption
- CWE-459: Incomplete Cleanup
CAPEC
References (4)
| URL | Tag | Source |
|---|---|---|
| https://github.com/nghttp2/nghttp2/blob/e7f59406556c80904b81b593d38508591bb7523a/lib/nghttp2_session.c#L3346 | Product |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://github.com/envoyproxy/envoy/security/advisories/GHSA-jfxv-29pc-x22r | 2023-10-24 | |
| https://access.redhat.com/security/cve/CVE-2023-35945 | 2023-09-14 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2217983 | 2023-09-14 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Envoyproxy Search vendor "Envoyproxy" | Envoy Search vendor "Envoyproxy" for product "Envoy" | < 1.23.11 Search vendor "Envoyproxy" for product "Envoy" and version " < 1.23.11" | - |
Affected
| ||||||
| Envoyproxy Search vendor "Envoyproxy" | Envoy Search vendor "Envoyproxy" for product "Envoy" | >= 1.24.0 < 1.24.9 Search vendor "Envoyproxy" for product "Envoy" and version " >= 1.24.0 < 1.24.9" | - |
Affected
| ||||||
| Envoyproxy Search vendor "Envoyproxy" | Envoy Search vendor "Envoyproxy" for product "Envoy" | >= 1.25.0 < 1.25.8 Search vendor "Envoyproxy" for product "Envoy" and version " >= 1.25.0 < 1.25.8" | - |
Affected
| ||||||
| Envoyproxy Search vendor "Envoyproxy" | Envoy Search vendor "Envoyproxy" for product "Envoy" | >= 1.26.0 < 1.26.3 Search vendor "Envoyproxy" for product "Envoy" and version " >= 1.26.0 < 1.26.3" | - |
Affected
| ||||||
| Nghttp2 Search vendor "Nghttp2" | Nghttp2 Search vendor "Nghttp2" for product "Nghttp2" | < 1.55.1 Search vendor "Nghttp2" for product "Nghttp2" and version " < 1.55.1" | - |
Affected
| ||||||