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CVE-2021-27876

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

Basic Information

CVE State
PUBLISHED
Reserved Date
March 01, 2021
Published Date
March 01, 2021
Last Updated
February 03, 2025
Vendor
n/a
Product
n/a
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.

CVSS Scores

CVSS v3.1

8.1 - HIGH

Vector: CVSS:3.1/AC:L/AV:N/A:N/C:H/I:H/PR:L/S:U/UI:N

SSVC Information

Exploitation
active
Technical Impact
total

Exploit Status

Exploited in the Wild
Yes (added 2023-04-07 00:00:00 UTC) Source
Used in Malware
Yes (added 2023-04-07 00:00:00 UTC) Source

References

https://www.veritas.com/content/support/en_US/security/VTS21-001#issue2 http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html

Known Exploited Vulnerability Information

Source Added Date
CISA 2023-04-07 00:00:00 UTC

Scanner Integrations

Scanner URL Date Detected
Metasploit https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/veritas/beagent_sha_auth_rce.rb 2025-04-29 11:01:25 UTC