Status: KEV | Advisory ID: CVE-2021-27137
| CVE | CVE-2021-27137 |
| Affected products | DD-WRT DD-WRT |
| Exploitation status | Listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation. |
| Classified as | CWE-121 (Stack-based Buffer Overflow) |
| KEV listing | Added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-07-21. |
| Exploitation prediction (EPSS) | 4% probability of exploitation in the next 30 days (90% percentile) -- FIRST.org's EPSS model. |
| Federal remediation deadline | 2026-07-24 (CISA KEV, Binding Operational Directive). |
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.
| Source | Reference |
|---|---|
| NVD | https://nvd.nist.gov/vuln/detail/CVE-2021-27137 |