CVE-2025-60691: e1200 Stack Overflow — Exploit

Description

A stack-based buffer overflow exists in the httpd binary of Linksys E1200 v2 routers (Firmware E1200_v2.0.11.001_us.tar.gz). The apply_cgi and block_cgi functions copy user-supplied input from the "url" CGI parameter into stack buffers (v36, v29) using sprintf without bounds checking. Because these buffers are allocated as single-byte variables, any non-empty input will trigger a buffer overflow. Remote attackers can exploit this vulnerability via crafted HTTP requests to execute arbitrary code or cause denial of service without authentication.

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CVSS v3.1 Score

8.8

HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-121 CWE-121

Affected Products

Vendor	Product	Versions
linksys	e1200_firmware	All
linksys	e1200	All

References

Exploits

https://github.com/yifan20020708/SGTaint-0-day/blob/main/Linksys/Linksys-E1200/CVE-2025-60691.md

Other References

http://linksys.com https://www.linksys.com/

Frequently Asked Questions

What is CVE-2025-60691? +

A stack-based buffer overflow exists in the httpd binary of Linksys E1200 v2 routers (Firmware E1200_v2.0.11.001_us.tar.gz). The apply_cgi and block_cgi functions copy user-supplied input from the "url" CGI parameter into stack buffers (v36, v29) using sprintf without bounds checking. Because these buffers are allocated as single-byte variables, any non-empty input will trigger a buffer overflow. Remote attackers can exploit this vulnerability via crafted HTTP requests to execute arbitrary code or cause denial of service without authentication. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-60691? +

CVE-2025-60691 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-60691? +

CVE-2025-60691 affects products from linksys, specifically: e1200, e1200_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-60691? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-60691