CVE-2025-65288Public exploit

Persistent service outage via unchecked DHCP hostname copy

Published Dec 9, 2025 · Updated Dec 10, 2025

Buffer overflow in Mercury MR816v2 firmware 081C3114 4.8.7 Build 110427 Rel 36550n allows remote attackers on the LAN to interrupt router service. The DHCP service copies and concatenates a client-supplied hostname longer than about 250 bytes into fixed-size buffers without validation or truncation. Any unauthenticated LAN host can corrupt adjacent memory with one DHCP transaction, leaving DHCP and the management interface unavailable until a physical reboot.

CVSS severity6.5
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Mercury MR816v2 firmware 081C3114 4.8.7 Build 110427 Rel 36550n allows remote attackers on the LAN to interrupt router service. The DHCP service copies and concatenates a client-supplied hostname longer than about 250 bytes into fixed-size buffers without validation or truncation. Any unauthenticated LAN host can corrupt adjacent memory with one DHCP transaction, leaving DHCP and the management interface unavailable until a physical reboot.

The record

CVE
CVE-2025-65288
Published
Dec 9, 2025
Updated
Dec 10, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 10, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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