Authentication Bypass in Unraid (CVE‑2020‑5849) Enables Admin Interface Takeover
What It Is – Unraid 6.9.0 and earlier contain an authentication bypass that lets an unauthenticated actor reach the web‑based administrative console. The flaw can be chained with CVE‑2020‑5847 to achieve remote code execution on the host.
Exploitability – Publicly disclosed; proof‑of‑concept code exists. CVSS v3.1 base score 9.8 (Critical). No known active exploit‑as‑a‑service, but the vulnerability is trivial to weaponize in targeted attacks.
Affected Products – Unraid OS (all editions) prior to the security update released in March 2021.
Why It Matters for Trust & Control Assurance
- Access‑control integrity – The bypass defeats the core authentication control that underpins privileged‑access policies, a control objective mapped across SOC 2, ISO 27001, NIST CSF, and others.
- Audit‑ready evidence – Without proper authentication, logs of privileged activity become unreliable, eroding the defensible evidence needed for compliance audits.
- Continuous monitoring – Detecting anomalous admin‑console access requires real‑time monitoring; the flaw shows why that capability must be baked into any trust‑center strategy.
Recommended Actions
- Deploy Unraid’s latest security patch that resolves CVE‑2020‑5849.
- Review and harden admin‑interface access controls (restrict IP ranges, enable MFA where possible).
- Enable detailed logging of all admin‑console sessions and forward logs to a SIEM for continuous monitoring.
- Conduct a post‑patch validation to confirm no unauthorized accounts remain.
Source: CISA KEV – CVE‑2020‑5849