CVE-2025-51085Public exploitNetwork attack vector

Service interruption via unbounded timeZone stack copy

Published Jul 24, 2025 · Updated Jul 5, 2026

Stack-based buffer overflow in Tenda AC8 v4 firmware 16.03.34.06 allows remote attackers to interrupt service via an HTTP POST request. The fromSetSysTime handler accepts timeType=sync, then passes the unbounded timeZone value to strcpy for copying into a stack buffer. No authentication or user interaction is required, and the documented consequence is limited to service interruption rather than data disclosure or modification.

CVSS severity5.3
Medium
EPSS probability6.61%
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-based buffer overflow in Tenda AC8 v4 firmware 16.03.34.06 allows remote attackers to interrupt service via an HTTP POST request. The fromSetSysTime handler accepts timeType=sync, then passes the unbounded timeZone value to strcpy for copying into a stack buffer. No authentication or user interaction is required, and the documented consequence is limited to service interruption rather than data disclosure or modification.

The record

CVE
CVE-2025-51085
Published
Jul 24, 2025
Updated
Jul 5, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 5, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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-121Stack-based 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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