CVE-2021-27137

DD-WRT DD-WRT Vulnerability

DD-WRT contains a stack-based buffer overflow vulnerability that could allow an unauthenticated attacker to overflow an internal buffer used by UPnP and trigger a code execution vulnerability.

CVSS Score

9.8

CRITICAL

Published

21 Jul 2026 00:00

Modified

N/A

Vendor

DD-WRT

Product

DD-WRT

Source

CIRCL

Affected Versions

Fix Vendor Patch / Mitigation Available

Weaknesses (CWE)

CWE-121

References

nvd.nist.gov /vuln/detail/CVE-2021-27137 cve.circl.lu /cve/CVE-2021-27137 cve.mitre.org /cgi-bin/cvename.cgi vuldb.com /

Affected Systems

DD-WRT

External Links

NVD Database CIRCL CISA KEV

KEV Status

Known Exploited Vulnerability