CVE-2025-55499Public exploitNetwork attack vector

Stack memory corruption via unchecked ntpServer copy

Published Aug 20, 2025 · Updated Aug 20, 2025

Stack buffer overflow in Tenda AC6 firmware 15.03.06.23_multi allows remote attackers to corrupt memory via a crafted ntpServer value. The fromSetSysTime handler passes the POST parameter to strcpy without bounding it to the destination stack buffer. The published proof of concept sends the request to /goform/SetSysTimeCfg with a password cookie; no specific post-corruption outcome is demonstrated.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Stack buffer overflow in Tenda AC6 firmware 15.03.06.23_multi allows remote attackers to corrupt memory via a crafted ntpServer value. The fromSetSysTime handler passes the POST parameter to strcpy without bounding it to the destination stack buffer. The published proof of concept sends the request to /goform/SetSysTimeCfg with a password cookie; no specific post-corruption outcome is demonstrated.

The record

CVE
CVE-2025-55499
Published
Aug 20, 2025
Updated
Aug 20, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

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

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1190Exploit Public-Facing Application

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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