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CVE-2025-62408— c-ares has a Use After Free vulnerability when connection is cleaned up after error

Quick assessment

Affected
c-ares c-ares
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

c-ares是c-ares个人开发者的一个用于异步 DNS 请求的 C 库。 c-ares 1.32.3版本至1.34.5版本存在资源管理错误漏洞，该漏洞源于read_answer和process_answer函数在最大尝试次数后终止查询，可能导致拒绝服务。

CVSS 5.9 · Medium EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-62408

Vulnerability Information
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Vulnerability Title
c-ares has a Use After Free vulnerability when connection is cleaned up after error
Source: CVE Program / CVE List V5
Vulnerability Description
c-ares is an asynchronous resolver library. Versions 1.32.3 through 1.34.5 terminate a query after maximum attempts when using read_answer() and process_answer(), which can cause a Denial of Service. This issue is fixed in version 1.34.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
c-ares 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
c-ares是c-ares个人开发者的一个用于异步 DNS 请求的 C 库。 c-ares 1.32.3版本至1.34.5版本存在资源管理错误漏洞，该漏洞源于read_answer和process_answer函数在最大尝试次数后终止查询，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
c-ares c-ares > 1.32.3, < 1.34.6 -

II. Public POCs for CVE-2025-62408

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III. Intelligence Information for CVE-2025-62408

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Patches & Fixes for CVE-2025-62408 (1)

IV. Related Vulnerabilities

Same product: c-ares
Same vendor: c-ares
Same weakness: CWE-416

V. Comments for CVE-2025-62408

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