How severe is CVE-2025-5688?

CVE-2025-5688 has a CVSS 4.0 base score of 7.5, rated high severity.

Is CVE-2025-5688 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-5688?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-5688 have an EU (EUVD) identifier?

Yes. CVE-2025-5688 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16897.

When was CVE-2025-5688 published?

CVE-2025-5688 was published on 2025-06-04 and last updated on 2026-06-17.

CVE-2025-5688

CVE-2025-5688 is a high-severity vulnerability with a CVSS 4.0 base score of 7.5. 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-787.

Key facts

Severity: High (CVSS 4.0 base score 7.5)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-16897
Weakness: CWE-787
Published: 2025-06-04
Last modified: 2026-06-17

Description

We have identified a buffer overflow issue allowing out-of-bounds write when processing LLMNR or mDNS queries with very long DNS names. This issue only affects systems using Buffer Allocation Scheme 1 with LLMNR or mDNS enabled. Users should upgrade to the latest version and ensure any forked or derivative code is patched to incorporate the new fixes.

Frequently asked questions

What is CVE-2025-5688?: We have identified a buffer overflow issue allowing out-of-bounds write when processing LLMNR or mDNS queries with very long DNS names. This issue only affects systems using Buffer Allocation Scheme 1 with LLMNR or mDNS enabled. Users should upgrade to the latest version and ensure any forked or derivative code is patched to incorporate the new fixes.
How severe is CVE-2025-5688?: CVE-2025-5688 has a CVSS 4.0 base score of 7.5, rated high severity.
Is CVE-2025-5688 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-5688?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-5688 have an EU (EUVD) identifier?: Yes. CVE-2025-5688 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16897.
When was CVE-2025-5688 published?: CVE-2025-5688 was published on 2025-06-04 and last updated on 2026-06-17.

References

Other CWE-787 (Out-of-bounds Write) vulnerabilities

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