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Findings

CVE-2021-27877

Veritas Backup Exec Agent Improper Authentication Vulnerability

Published Mar 1, 2021 · updated Jun 16, 2026 · veritas backup exec

An issue was discovered in Veritas Backup Exec before 21.2. It supports multiple authentication schemes: SHA authentication is one of these. This authentication scheme is no longer used in current versions of the product, but hadn't yet been disabled. An attacker could remotely exploit this scheme to gain unauthorized access to an Agent and execute privileged commands.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 1, 2021 · Catalog

    Detected

    An issue was discovered in Veritas Backup Exec before 21.2. It supports multiple authentication schemes: SHA authentication is one of these. This authentication scheme is no longer used in current versions of the product, but hadn't yet been disabled. An attacker could remotely exploit this scheme to gain unauthorized access to an Agent and execute privileged commands.

  2. Apr 7, 2023 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Apr 28, 2023 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    An issue was discovered in Veritas Backup Exec before 21.2. It supports multiple authentication schemes: SHA authentication is one of these. This authentication scheme is no longer used in current versions of the product, but hadn't yet been disabled. An attacker could remotely exploit this scheme to gain unauthorized access to an Agent and execute privileged commands.

Required action

Apply updates per vendor instructions.

CISA due date Apr 28, 2023

Affected

  • cpe veritas/backup execversion unspecified
  • vendor Veritas Backup Exec Agentversion unspecified

Sources

  • CISA KEVConfirmed exploitationCVE-2021-27877

    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.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2021-27877

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-27877

    30-day exploitation probability 64.9%

    first.org
  • Metasploit ModulesPublic exploit moduleexploit_multi/veritas/beagent_sha_auth_rce

    Public module reference (excellent). Module source is not copied into this catalog.

    rapid7.com
  • NIST NVDVulnerability recordCVE-2021-27877

    An issue was discovered in Veritas Backup Exec before 21.2. It supports multiple authentication schemes: SHA authentication is one of these. This authentication scheme is no longer used in current versions of the product, but hadn't yet been disabled. An attacker could remotely e

    nvd.nist.gov
  • Packet Storm SecurityCited referencehttp://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com

References

CVE-2021-27877 · ZeroDay Findings