CVE-2021-27877
Actively exploited. CVE-2021-27877 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-04-07) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2021-27877 is indexed in Metasploit, GitHub PoC and Nuclei. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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
- 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.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2021-27877 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- MetasploitA Metasploit Framework module targets this CVE — weaponized, point-and-click exploitation.look it up ↗
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
- NucleiA nuclei-templates detection/PoC template exists for this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2021-27877: Veritas Backup Exec Agent Improper Authentication Vulnerabilitycisa-kev · 2023-04-07
External references
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[](https://www.csirts.com/cve/CVE-2021-27877)