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CVE-2021-28799: QNAP NAS Improper Authorization Vulnerability

criticalknown exploitedpublic exploitCVE-2021-28799
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
QNAP NAS running HBS 3 contains an improper authorization vulnerability which can allow remote attackers to log in to a device.

CSIRTS triage

vendor: QNAPproduct: NASAuthentication bypassaffected: HBS 3
What
QNAP NAS running HBS 3 contains an improper authorization vulnerability which can allow remote attackers to log in to a device.
Who is affected
Users of QNAP NAS devices running HBS 3 are affected.
Urgency
Immediate remediation is necessary due to active exploitation and critical severity.
Action
Update the HBS 3 software to the latest version to fix this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-03-31
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-28799

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-28799coverage & exploitation statusNVD · CVE.org

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