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CVE-2021-27877: Veritas Backup Exec Agent Improper Authentication Vulnerability

criticalknown exploitedpublic exploitCVE-2021-27877
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.
Veritas Backup Exec (BE) Agent contains an improper authentication vulnerability that could allow an attacker unauthorized access to the BE Agent via SHA authentication scheme.

CSIRTS triage

vendor: Veritasproduct: Backup ExecAuthentication bypass
What
Veritas Backup Exec (BE) Agent contains an improper authentication vulnerability that could allow an attacker unauthorized access to the BE Agent.
Who is affected
Deployments of Veritas Backup Exec Agent.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Update to the latest version of Veritas Backup Exec.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2023-04-07
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-27877

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-2021-27877coverage & exploitation statusNVD · CVE.org

Recent advisories for Veritas Backup Exec

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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