CVE-2025-5688

7.5 HIGH 0.4% exploit odds Fix listed Memory safety

What it is

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.

At a glance

Exploitability: Can be exploited locally on the machine without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 0.4% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2025-06-04 17:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 09:48 UTC Last updatedMost recent change to the record

Details

Published: 2025-06-04 17:15 UTC
Last modified: 2026-06-17 09:48 UTC
Exploit probability: 0.4% · EPSS, next 30 days
Weakness: CWE-787 · Out-of-bounds write
Record status: Deferred

Attack profile CVSS 4.0 · 7.5

Attack vector: Local
Complexity: Low
Attack requirements: Present
Privileges needed: None
User interaction: None
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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Fix and advisories

References

NVD record · CVE.org record