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.
Advisories
Source ID Title
EUVD EUVD EUVD-2014-9815 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.
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 31 Jul 2025 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Linksys
Linksys wrt120n
Vendors & Products Linksys
Linksys wrt120n

Thu, 31 Jul 2025 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 31 Jul 2025 15:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Linksys WRT120N tmUnblock.cgi Stack-Based Buffer Overflow Admin Password Reset
Weaknesses CWE-121
References
Metrics cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2025-07-31T17:58:15.493Z

Reserved: 2025-07-30T14:54:06.838Z

Link: CVE-2014-125122

cve-icon Vulnrichment

Updated: 2025-07-31T17:58:06.182Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-07-31T15:15:34.620

Modified: 2025-07-31T18:42:37.870

Link: CVE-2014-125122

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-07-31T20:20:37Z