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Vulnerabilities

Vulnerability · CVE-2025-54588

Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures.

Published Sep 2, 2025 · catalog updated Sep 3, 2025 · Envoy is an open

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-54588. EPSS is 0.47%. Act only if a listed version of Envoy is an open 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 an open).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.47%
Remediation
Version ranges on file
Affected products
vendor envoyproxy envoy 1.35.0, < 1.35.1

Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. Versions 1.34.0 through 1.34.4 and 1.35.0 contain a use-after-free (UAF) vulnerability in the DNS cache, causing abnormal process termination. The vulnerability is in Envoy's Dynamic Forward Proxy implementation, occurring when a completion callback for a DNS resolution triggers new DNS resolutions or removes existing pending resolutions. This condition may occur when the following conditions are met: dynamic Forwarding Filter is enabled, the runtime flag is enabled, and the Host he

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.

  • vendor envoyproxy envoy 1.35.0, < 1.35.11.35.0, < 1.35.1

How to fix CVE-2025-54588

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-2025-54588. EPSS is 0.47%. Act only if a listed version of Envoy is an open is installed.

Which versions are affected?

Compare what you have installed with envoyproxy envoy 1.35.0, < 1.35.1 1.35.0, < 1.35.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.47%. 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. Sep 2, 2025 · EUVD

    Detected

    Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. Versions 1.34.0 through 1.34.4 and 1.35.0 contain a use-after-free (UAF) vulnerability in the DNS cache, causing abnormal process termination. The vulnerability is in Envoy's Dynamic Forward Proxy implementation, occurring when a completion callback for a DNS resolution triggers new DNS

  2. Sep 3, 2025 · EUVD

    Updated

    Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. Versions 1.34.0 through 1.34.4 and 1.35.0 contain a use-after-free (UAF) vulnerability in the DNS cache, causing abnormal process termination. The vulnerability is in Envoy's Dynamic Forward Proxy implementation, occurring when a completion callback for a DNS resolution triggers new DNS

Sources

  • CVE.orgVulnerability recordCVE-2025-54588

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-54588

    30-day exploitation probability 0.47%

    first.org
  • EUVDVulnerability recordEUVD-2025-26470

    Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. Versions 1.34.0 through 1.34.4 and 1.35.0 contain a use-after-free (UAF) vulnerability in the DNS cache, causing abnormal process termination. The vulnerability is in

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 22, 2026
  • EUVDOct 22, 2026