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PatchSiren cyber security CVE debrief

CVE-2020-5849 Unraid CVE debrief

CVE-2020-5849 is an Unraid authentication bypass vulnerability that CISA has included in its Known Exploited Vulnerabilities catalog. In the supplied official sources, CISA directs defenders to apply updates per the vendor’s instructions. Because the source corpus is limited, the affected versions, attack details, and CVSS score are not provided here; however, KEV inclusion means this issue should be treated as a priority patching item.

Vendor
Unraid
Product
Unraid
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Unraid administrators, infrastructure and operations teams, security operations, and any organization that relies on Unraid systems should review this CVE promptly. Because it appears in CISA’s KEV catalog, exposure may indicate active exploitation or elevated risk, so asset owners and patch managers should prioritize it.

Technical summary

The supplied official records identify CVE-2020-5849 as an authentication bypass vulnerability affecting Unraid. CISA’s KEV entry confirms it as a known exploited vulnerability and recommends applying updates per vendor instructions. The corpus does not include version ranges, exploit mechanics, or a CVSS rating, so those details should be confirmed directly from vendor or NVD references.

Defensive priority

High. KEV inclusion is a strong signal to accelerate remediation, even when the source corpus does not provide scoring details. Organizations with any Unraid deployments should verify exposure, review vendor guidance, and patch as soon as operationally feasible.

Recommended defensive actions

  • Inventory all Unraid deployments and confirm whether any instance is exposed or business-critical.
  • Apply vendor updates and follow the vendor’s instructions referenced by CISA KEV.
  • Validate that remediation was successful and that the affected systems are on a supported, patched release.
  • Monitor official vendor, CISA, and NVD references for any additional guidance or version-specific details.
  • If immediate patching is not possible, apply compensating controls to reduce access to Unraid management interfaces until updates are completed.

Evidence notes

This debrief is based only on the supplied official source corpus: the CISA KEV entry and the linked NVD/CVE record references. The corpus confirms the vulnerability name, vendor/product, KEV status, date added, and CISA’s required action, but does not provide affected versions, exploit technique details, or CVSS scoring. No unsupported facts have been added.

Official resources

CVE-2020-5849 was published and modified on 2021-11-03 in the supplied timeline. CISA added the issue to the Known Exploited Vulnerabilities catalog on 2021-11-03 with a due date of 2022-05-03. Treat the publication and KEV dates as source-