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CVE-2021-27876: Veritas Backup Exec Agent File Access Vulnerability

criticalknown exploitedpublic exploitCVE-2021-27876
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 a file access vulnerability that could allow an attacker to specially craft input parameters on a data management protocol command to access files on the BE Agent machine.

CSIRTS triage

vendor: Veritasproduct: Backup ExecOther
What
Veritas Backup Exec (BE) Agent contains a file access vulnerability that could allow an attacker to access files on the BE Agent machine.
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-2021-27876

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-2021-27876coverage & 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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