Stack-based Buffer Overflow in Tenda AC5 Router
CVE-2025-6887

8.7HIGH

Key Information:

Vendor

Tenda
Status
Ac5
Vendor
CVE Published:
30 June 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-6887?

The Tenda AC5 router contains a vulnerability that allows for stack-based buffer overflow via the '/goform/SetSysTimeCfg' endpoint. The issue is triggered when manipulating the 'time' or 'timeZone' parameters, leading to potential remote exploitation. Attackers could exploit this vulnerability to execute arbitrary code or cause a denial of service. It's critical for users to update their devices and follow security best practices to mitigate risks associated with this flaw.

Affected Version(s)

AC5 15.03.06.47

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-2025-6887 - Proof of Concept

References

https://vuldb.com/?id.314366
vdb-entrytechnical-description
https://vuldb.com/?ctiid.314366
signaturepermissions-required
https://vuldb.com/?submit.603788
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

yhryhryhr_tu (VulDB User)
.
CVE-2025-6887 : Stack-based Buffer Overflow in Tenda AC5 Router