CVEvulnerability

CVE-2021-27876

8.1 HIGH Known exploited Published 2021-03-01 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

Veritas Backup Exec Agent File Access Vulnerability — Veritas Backup Exec Agent

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.

Added to KEV
2023-04-07
Remediation due
2023-04-28
Ransomware use
Known
Required action
Apply updates per vendor instructions.
Notes
https://www.veritas.com/support/en_US/security/VTS21-001; https://nvd.nist.gov/vuln/detail/CVE-2021-27876
Status
Analyzed
Published
2021-03-01
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
8.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS 3.1 ([email protected])
8.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS 2.0 ([email protected])
7.5 HIGH — AV:N/AC:L/Au:S/C:C/I:P/A:N

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.

Affected configurations

• veritas backup exec (< 21.2)

References