How severe is CVE-2025-62408?

CVE-2025-62408 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-62408 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-62408?

CVE-2025-62408 affects C-ares. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-62408?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-62408 have an EU (EUVD) identifier?

Yes. CVE-2025-62408 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201830.

When was CVE-2025-62408 published?

CVE-2025-62408 was published on 2025-12-08 and last updated on 2026-06-17.

CVE-2025-62408

CVE-2025-62408 is a medium-severity vulnerability in C-ares with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201830
Weakness: CWE-416
Affected product: C-ares
Published: 2025-12-08
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-62408?: 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.
How severe is CVE-2025-62408?: CVE-2025-62408 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-62408 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-62408?: CVE-2025-62408 affects C-ares. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-62408?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-62408 have an EU (EUVD) identifier?: Yes. CVE-2025-62408 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201830.
When was CVE-2025-62408 published?: CVE-2025-62408 was published on 2025-12-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:c-ares:c-ares:*:*:*:*:*:*:*:*

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CVE-2016-5180 — Critical (CVSS 9.8): Heap-based buffer overflow in the ares_create_query function in c-ares 1.x before 1.12.0 allows remote attackers to…
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CVE-2020-22217 — Medium (CVSS 5.9): Buffer overflow vulnerability in c-ares before 1_16_1 thru 1_17_0 via function ares_parse_soa_reply in…
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