CVE-2012-10021: D-Link DIR-605L Captcha Handling Buffer Overflow

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-07-31 · updated 2026-06-16
Weakness: CWE-121

Description

A stack-based buffer overflow vulnerability exists in D-Link DIR-605L Wireless N300 Cloud Router firmware versions 1.12 and 1.13 via the getAuthCode() function. The flaw arises from unsafe usage of sprintf() when processing user-supplied CAPTCHA data via the FILECODE parameter in /goform/formLogin. A remote unauthenticated attacker can exploit this to execute arbitrary code with root privileges on the device.

Affected products

D-Link DIR-605L: from 1.12 through 1.13

References

https://forums.dlink.com/index.php?topic=51923.0
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/linux/http/dlink_dir605l_captcha_bof.rb
https://web.archive.org/web/20121012062554/http://www.devttys0.com/2012/10/exploiting-a-mips-stack-overflow/
https://www.exploit-db.com/exploits/29127
https://www.vulncheck.com/advisories/dlink-dir605l-captcha-handling-stack-based-buffer-overflow

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