Buffer Overflow Vulnerability in Tenda AC7 Router
CVE-2026-4974

8.7HIGH

Key Information:

Vendor

Tenda
Status
Ac7
Vendor
CVE Published:
27 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4974?

A vulnerability has been identified in the Tenda AC7 router related to the fromSetSysTime function within the POST Request Handler component. This flaw can be exploited to achieve a stack-based buffer overflow by manipulating the Time argument in the /goform/SetSysTimeCfg file. Remote attackers could potentially leverage this vulnerability, exposing the router to various security risks. Given that the exploit has been publicly documented, it is crucial for users to implement timely updates to their devices to mitigate the threat.

Affected Version(s)

AC7 15.03.06.44

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-4974 - Proof of Concept

References

https://vuldb.com/?id.353861
vdb-entrytechnical-description
https://vuldb.com/?ctiid.353861
signaturepermissions-required
https://vuldb.com/?submit.778207
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

wxhwxhwxh_mie (VulDB User)
.