CVE-2021-27877

Known Exploited (CISA KEV)HIGH

8.2

CVSS Severity Score

EPSS Score69.9430%

EPSS Percentile95.74th

PublishedMar 1, 2021

Last ModifiedNov 3, 2025

Vulnerability Description

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.

Affected Platforms (CPE)

📦

Veritas

Backup Exec

< 21.2

References & Advisories

🔗 http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html

🔗 https://www.veritas.com/content/support/en_US/security/VTS21-001#issue1