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CVE-2021-27137

DD-WRT Stack-Based Buffer Overflow Vulnerability

8.1
CVSS
16.5%
EPSS (exploit prob.)
96.7%
EPSS percentile
Yes
Actively exploited
No
Ransomware use
2026-07-21
Added

Summary

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.

Affected software

Vendor: DD-WRT  ·  Product: DD-WRT

Weakness types (CWE):

CWE-121

What to do

This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.

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All information is aggregated from public sources for awareness only and does not constitute an accusation or a security assessment. No personal data or credentials are published.