Buffer Overflow Vulnerability in TP-Link TL-WR940N Router
CVE-2025-6151

8.2HIGH

Key Information:

Vendor

Tp-link Systems Inc.

Status
Tl-wr940n V4
Tl-wr841n V11
Vendor
CVE Published:
17 June 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-6151?

A buffer overflow vulnerability has been identified in the TP-Link TL-WR940N V4 router, specifically affecting the functionality associated with the file /userRpm/WanSlaacCfgRpm.htm. The flaw arises from improper handling of the 'dnsserver1' argument, allowing attackers to exploit this vulnerability remotely. Given its public disclosure, this exploit may be actively targeted, compromising the device's security.

Affected Version(s)

TL-WR841N V11 0 <= 160325

TL-WR940N V4 0 <= 160617

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-2025-6151 - Proof of Concept

References

https://www.tp-link.com/us/support/faq/4536/
https://github.com/WhereisDoujo/CVE/issues/7
https://vuldb.com/?id.312626

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
None
Integrity:
None
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

MTHG (VulDB User)
.
CVE-2025-6151 : Buffer Overflow Vulnerability in TP-Link TL-WR940N Router