CVE‑2021‑27137: DD‑WRT Stack‑Based Buffer Overflow Allows Remote Code Execution
What It Is — DD‑WRT firmware contains a stack‑based buffer overflow in its UPnP implementation. An unauthenticated attacker can overflow an internal buffer and trigger arbitrary code execution on the router.
Exploitability — The flaw is remotely exploitable over the network; proof‑of‑concept code is publicly available. CVSS v3.1 base score 8.8 (High).
Affected Products — All DD‑WRT firmware versions prior to the security release referenced in the CISA KEV advisory.
Why It Matters for Trust & Control Assurance
- Highlights the necessity of continuous vulnerability monitoring and timely patching as demonstrable evidence of due‑diligence.
- A missing patch creates a gap in the Vulnerability Management control objective, a cornerstone for audit readiness across NIST CSF, ISO 27001, and other frameworks.
- Enterprises that can produce verifiable remediation records can more confidently satisfy third‑party security reviews and maintain a defensible trust posture.
Recommended Actions
- Inventory all DD‑WRT devices and verify the firmware version.
- Apply the vendor‑released patch immediately.
- Record the remediation step in your change‑management system to generate audit‑ready evidence.
- Integrate automated network‑device scanning into your continuous control‑monitoring platform.
Source: CISA KEV, NVD