CVE-2026-31065Public exploit

Authenticated denial of service via unbounded strcpy

Published Apr 6, 2026 · Updated Apr 6, 2026

Buffer overflow in UTT Aggressive 520W firmware 3v1.7.7-180627 and earlier allows remote authenticated users to interrupt service. The formConfigCliForEngineerOnly handler copies the addCommand value with strcpy to InstPointByName + 20 without checking its length. Exploitation requires admin-level access from an adjacent network; sources report a service interrupt but do not identify a crash, reboot, or hang.

CVSS severity4.5
Medium
EPSS probability0.23%
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 UTT Aggressive 520W firmware 3v1.7.7-180627 and earlier allows remote authenticated users to interrupt service. The formConfigCliForEngineerOnly handler copies the addCommand value with strcpy to InstPointByName + 20 without checking its length. Exploitation requires admin-level access from an adjacent network; sources report a service interrupt but do not identify a crash, reboot, or hang.

The record

CVE
CVE-2026-31065
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Apr 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 6, 2026Record 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.5CISA-ADPCVSS:3.1/AV:A/AC:L/PR:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499Endpoint Denial of Service

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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