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C Ares CVE-2025-62408

| EUVDEUVD-2025-201830 MEDIUM
Use After Free (CWE-416)
2025-12-08 security-advisories@github.com
Denial Of Service Use After Free Memory Corruption C Ares
5.9
CVSS 3.1 · Vendor: github
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Vulnerability Assessment

Weakness
CWE
CWE-416
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Memory lifecycle management
MITRE ATT&CK

2 techniques across 2 tactics: Execution, Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

Memory corruption that can be exploited for arbitrary code execution, information disclosure, or denial of service. With a CVSS score of 5.9 (MEDIUM), this represents a moderate risk.
Exploit ScenarioDerived

An attacker triggers a specific sequence of operations that causes the application to free a memory block and then reference it again, potentially executing attacker-controlled data.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 15, 2026

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.

Earlier versions of this analysis (1)
v1 Mar 15, 2026 - 17:54 CVSS 5.9

RemediationAI

A vendor patch is available — apply it immediately. Use memory-safe languages. Implement proper object lifecycle management. Use static and dynamic analysis tools to detect UAF patterns.

Affected VersionsENISA

c-ares > 1.32.3, < 1.34.6

Affected Packages

euvd c_ares_1_32_3 fix: 1.34.6

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Technical ContextAI · show details

A use-after-free vulnerability occurs when a program continues to use a pointer after the referenced memory has been freed, leading to undefined behavior. This vulnerability is classified as Use After Free (CWE-416).

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (github) PRIMARY 5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE MEDIUM
Red Hat 5.9 MEDIUM

Primary rating from Vendor (github).

CVSS VectorVendor: github

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Patch released
Mar 15, 2026 - 17:54 nvd
Patch available
CVE Published
Dec 08, 2025 - 22:15 nvd
MEDIUM 5.9

Executive ViewAI

Why It Matters

Organizations using c-ares should be aware of moderate risk from CVE-2025-62408, a use-after-free vulnerability rated CVSS 5.9. Exploitation could compromise the security of affected deployments. A patch is available and should be applied during regular vulnerability management.

Business Impact: Low
Compensating Controls

Apply vendor patch. If patching is delayed: enable ASLR/DEP, apply network segmentation.

Threat Intelligence Overview

EPSS Score
0.0%
Top 95% exploitable
Data Quality
6 sources
Confidence: High
EUVD NVD CVE.org EPSS Vendor GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact
Low

Priority Score

30
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +30
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Use After Free HIGH

Use-after-free vulnerabilities occur when a program continues to access memory through a pointer after that memory has been deallocated.

Memory Corruption HIGH

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

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9.8 Oct 03

Heap-based buffer overflow in the ares_create_query function in c-ares 1.x before 1.12.0 allows remote attackers to caus
CVE-2021-3672 MEDIUM POC
5.6 Nov 23

A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Se
CVE-2017-1000381 HIGH
7.5 Jul 07

The c-ares function `ares_parse_naptr_reply()`, which is used for parsing NAPTR responses, could be triggered to read me
CVE-2023-32067 HIGH
7.5 May 25

c-ares is an asynchronous resolver library. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable,

CVE-2020-8277 HIGH
7.5 Nov 19

A Node.js application that allows an attacker to trigger a DNS request for a host of their choice could trigger a Denial
CVE-2023-31147 MEDIUM
6.5 May 25

c-ares is an asynchronous resolver library. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable
CVE-2023-31130 MEDIUM
6.4 May 25

c-ares is an asynchronous resolver library. Rated medium severity (CVSS 6.4). No vendor patch available.
CVE-2023-31124 LOW
3.7 May 25

c-ares is an asynchronous resolver library. Rated low severity (CVSS 3.7), this vulnerability is remotely exploitable, n

Same weakness CWE-416 – Use After Free

View all
CVE-2019-0708 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2014-0322 HIGH POC
8.8
CVE-2012-4792 HIGH POC
8.8
CVE-2009-4324 HIGH POC
7.8
CVE-2015-0313 CRITICAL POC
9.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2013-2551 HIGH POC
8.8

Same technique Denial Of Service

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CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2011-0609 HIGH POC
7.8

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.2 Fixed
SUSE Linux Enterprise Micro 5.3 Fixed

References

Advisories & patches
PATCH https://github.com/c-ares/c-ares/commit/714bf5675c541bd1e668a8db8e67ce012651e618 PATCH https://github.com/c-ares/c-ares/security/advisories/GHSA-jq53-42q6-pqr5

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