SB2025121089 - Denial of service in Envoy

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Main Vulnerability Database SB2025121089

SB2025121089 - Denial of service in Envoy

Published: December 10, 2025

Security Bulletin ID SB2025121089
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: N/A)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to perform a denial of service attack

The vulnerability exists due to a use-after-free error during the ares_getaddrinfo query lifecycle when processing a specific sequence of DNS responses. A remote attacker can send a specially crafted DNS response to the application and perform a denial of service attack. 

Note, the vulnerability exists due to usage of the vulnerable c-ares library - #VU119383 (CVE-2025-6240).


Remediation

Install update from vendor's website.

References