CVE-2014-125122

A stack-based buffer overflow vulnerability exists in the tmUnblock.cgi endpoint of the Linksys WRT120N wireless router. The vulnerability is triggered by sending a specially crafted HTTP POST request with an overly long TM_Block_URL parameter to the endpoint. By exploiting this flaw, an unauthenticated remote attacker can overwrite memory in a controlled manner, enabling them to temporarily reset the administrator password of the device to a blank value. This grants unauthorized access to the router’s web management interface without requiring valid credentials.

CVSS v4.0

5.3 MEDIUMCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS

0.76% chance of exploitation in the next 30 days, 53th percentile

Published

2025-07-31

Updated

2026-04-07

Proof-of-concept exploits (2)

• https://web.archive.org/web/20210424073058/http://www.devttys0.com/2014/02/wrt120n-fprint…
• https://www.exploit-db.com/exploits/31758

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/auxiliary/admin/http/linksys_tmunblock_ad…

References

• CVE Record
• NVD entry

Related

• CVE-2014-125121
• CVE-2014-125123
• CVE-2014-125119
• CVE-2014-125124
• CVE-2014-125118
• CVE-2014-125125