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Back to active CVEs
High · CVSS 7.5CVE-2024-32475

Envoy RELEASE_ASSERT using auto_sni with :authority header > 255 bytesCVE-2024-32475

Answer in brief

CVE-2024-32475 records a High severity (CVSS 7.5) vulnerability in Envoy RELEASE_ASSERT using auto_sni with :authority header > 255 bytes. The current sources do not mark it as known exploited. The current feed maps envoyproxy/envoy (generic), envoyproxy/envoy (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 18, 2024Updated Nov 5, 2026Source checked Nov 5, 2026First seen by HOL Nov 5, 2026Material review Nov 5, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps envoyproxy/envoy (generic), envoyproxy/envoy (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
envoyproxy/envoygeneric>=1.30.0 <1.30.1 || >=1.29.0 <1.29.4 || >=1.28.0 <1.28.3 || >=1.13.0 <1.27.51.30.1, 1.29.4, 1.28.3, 1.27.5
envoyproxy/envoygeneric>=1.13.0 <1.27.51.27.5

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for envoyproxy/envoy, envoyproxy/envoy.
  2. 2Review the reported fix. Update envoyproxy/envoy to 1.30.1; envoyproxy/envoy to 1.27.5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Apr 18, 2024

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 5, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Envoy is a cloud-native, open source edge and service proxy. When an upstream TLS cluster is used with `auto_sni` enabled, a request containing a `host`/`:authority` header longer than 255 characters triggers an abnormal termination of Envoy process. Envoy does not gracefully handle an error when setting SNI for outbound TLS connection. The error can occur when Envoy attempts to use the `host`/`:authority` header value longer than 255 characters as SNI for outbound TLS connection. SNI length is limited to 255 characters per the standard. Envoy always expects this operation to succeed and abnormally aborts the process when it fails. This vulnerability is fixed in 1.30.1, 1.29.4, 1.28.3, and 1.27.5.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • ModSecurity: PCRE2 `@rxGlobal` match-limit errors are converted to no-matchAlso CWE-253

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-253, CWE-617
Source
CVE List V5
Source checked
Nov 5, 2026
References
2 linked sources
Open source record