CVE-2024-32475Network attack vector

Process crash via unchecked SNI setter failure

Published Apr 18, 2024 · Updated Aug 2, 2024

Denial of service in affected Envoy 1.13.0 through 1.30.0 releases allows remote attackers to crash the proxy via an oversized authority header. ClientContextImpl::newSsl passes the auto_sni-derived value to SSL_set_tlsext_host_name and asserts on its failed return instead of propagating the error. Reachability requires an upstream TLS cluster with auto_sni enabled and an authority or configured override header longer than 255 characters; a successful trigger terminates the process.

CVSS severity7.5
High
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Envoy 1.13.0 through 1.30.0 releases allows remote attackers to crash the proxy via an oversized authority header. ClientContextImpl::newSsl passes the auto_sni-derived value to SSL_set_tlsext_host_name and asserts on its failed return instead of propagating the error. Reachability requires an upstream TLS cluster with auto_sni enabled and an authority or configured override header longer than 255 characters; a successful trigger terminates the process.

The record

CVE
CVE-2024-32475
Published
Apr 18, 2024
Updated
Aug 2, 2024
Vendor
Envoy Proxy
Product
Envoy
Classifications
CWE-617, CWE-253, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.13.0, < 1.27.5
  2. Affected versionversion=1.13.0 <1.27.5
  3. Affected versionversion=>= 1.28.0, < 1.28.3
  4. Affected versionversion=>= 1.29.0, < 1.29.4
  5. Affected versionversion=>= 1.30.0, < 11.30.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Envoy Proxy · Envoyversion=>= 1.13.0, < 1.27.5; version=1.13.0 <1.27.5; version=>= 1.28.0, < 1.28.3; version=>= 1.29.0, < 1.29.4; version=>= 1.30.0, < 11.30.1

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
CWE-253Incorrect Check of Function Return Value
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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