Stack-based Buffer Overflow Vulnerability in Linksys WRT120N Wireless Router
CVE-2014-125122

5.3MEDIUM

Key Information:

Vendor

Linksys
Status
Wrt120n
Vendor
CVE Published:
31 July 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2014-125122?

The Linksys WRT120N wireless router is vulnerable to a stack-based buffer overflow through its tmUnblock.cgi endpoint. An attacker can exploit this vulnerability by sending a specially crafted HTTP POST request with an excessively long TM_Block_URL parameter. This allows the attacker to overwrite memory, which could lead to unauthorized access by resetting the administrator password to a blank value, thus bypassing authentication on the router's management interface.

Affected Version(s)

WRT120N 1.0.07

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-2014-125122 - Proof of Concept

CVE-2014-125122 - Proof of Concept

CVE-2014-125122 - Proof of Concept

References

https://raw.githubusercontent.com/rapid7/metasploit-frame...
exploit
https://www.exploit-db.com/exploits/31758
exploit
https://web.archive.org/web/20210424073058/http://www.dev...
technical-descriptionexploit

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Adjacent 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

Craig Heffner
.
CVE-2014-125122 : Stack-based Buffer Overflow Vulnerability in Linksys WRT120N Wireless Router