HOMEVULNERABILITIESCVE-2024-32475
HIGH

CVE-2024-32475

CWE-253Published: April 18, 2024· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2024-32475 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

envoyproxy1 product(s)
envoy
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/envoyproxy/envoy/commit/b47fc6648d7c2dfe0093a601d44cb704b7bad382
PATCHhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-3mh5-6q8v-25wj
PATCHhttps://github.com/envoyproxy/envoy/commit/b47fc6648d7c2dfe0093a601d44cb704b7bad382
PATCHhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-3mh5-6q8v-25wj

All References (4)

→
https://github.com/envoyproxy/envoy/commit/b47fc6648d7c2dfe0093a601d44cb704b7bad382Patch
→
https://github.com/envoyproxy/envoy/security/advisories/GHSA-3mh5-6q8v-25wjPatch · Vendor Advisory
→
https://github.com/envoyproxy/envoy/commit/b47fc6648d7c2dfe0093a601d44cb704b7bad382Patch
→
https://github.com/envoyproxy/envoy/security/advisories/GHSA-3mh5-6q8v-25wjPatch · Vendor Advisory

Quick Facts

CVE IDCVE-2024-32475
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-253
CISA KEVNo
Affected1 vendor(s)
PublishedApr 18, 2024

Related CVEs (CWE-253)

CVE-2023-4501
9.8
CVE-2017-7474
9.8
CVE-2026-35091
8.2
CVE-2025-57767
7.5
CVE-2023-24487
7.5
CVE-2024-1622
7.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2024-32475 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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