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High · 8.1 Known exploited · Ransomware Public exploit CVE-2021-27876 EUVD-2021-14614GHSA-9j5v-h34p-h6g6

An issue was discovered in Veritas Backup Exec before 21.2. The communication between a client and an Agent requires successful authenticat…

Published Mar 1, 2021 · Updated Oct 21, 2025 · Assigned by mitre

Description

An issue was discovered in Veritas Backup Exec before 21.2. The communication between a client and an Agent requires successful authentication, which is typically completed over a secure TLS communication. However, due to a vulnerability in the SHA Authentication scheme, an attacker is able to gain unauthorized access and complete the authentication process. Subsequently, the client can execute data management protocol commands on the authenticated connection. By using crafted input parameters in one of these commands, an attacker can access an arbitrary file on the system using System privileges.

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

Metasploit 1 module

GitHub 2 repositories

  • hyderpwn/veritas-backup ★ 1 · Aug 27, 2026

    Metasploit module: Veritas Backup Exec Agent SHA-auth NDMP remote code execution (CVE-2021-27876/27877/27878)

  • wingerbijay/CVE-2021-27876 ★ 1 · Jun 18, 2026

    Unauthenticated RCE exploit for Veritas Backup Exec Agent (CVE-2021-27876/77/78) — SHA auth bypass to SYSTEM via NDMP

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References