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Vulnerabilities

Vulnerability · CVE-2023-35945

Envoy is a cloud-native high-performance edge/middle/service proxy.

Published Jul 13, 2023 · catalog updated Oct 15, 2026 · Envoy is a cloud-native

Check if you run it

No confirmed exploitation is on record for CVE-2023-35945. EPSS is 1.65%. Act only if a listed version of Envoy is a cloud-native is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Envoy is a cloud-native).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.65%
Remediation
Advisory link
Affected products
cpe envoyproxy/envoy · cpe nghttp2/nghttp2

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 immediately followed by the frames from an upstream server. In nghttp2, cleanup of pending requests due to receipt of the 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 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe envoyproxy/envoyversion unspecified
  • cpe nghttp2/nghttp2version unspecified

How to fix CVE-2023-35945

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2023-35945. EPSS is 1.65%. Act only if a listed version of Envoy is a cloud-native is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-400: Uncontrolled Resource Consumption; CWE-459. EPSS 1.65%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 13, 2023 · NIST NVD

    Detected

    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 immediately followed by the frames from an upstream server. In nghttp2, cleanup of pending requests due to receipt of the frame skips de-allocation of the bookkeeping structure and pending compressed header. The error return [code path] is taken i

  2. Oct 15, 2026 · NIST NVD

    Updated

    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 immediately followed by the frames from an upstream server. In nghttp2, cleanup of pending requests due to receipt of the frame skips de-allocation of the bookkeeping structure and pending compressed header. The error return [code path] is taken i

Sources

  • CVE.orgVulnerability recordCVE-2023-35945

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2023-35945

    30-day exploitation probability 1.7%

    first.org
  • NIST NVDVulnerability recordCVE-2023-35945

    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 immediately followed by the frames from an upstream server. In nghttp2, cleanup of pending requests due t

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.