Unrated severityCISA KEVNVD Advisory· Published Mar 1, 2021· Updated Oct 21, 2025
CVE-2021-27877
CVE-2021-27877
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- Veritas/Backup Execdescription
- Range: <21.2
Patches
Vulnerability mechanics
References
2- packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.htmlmitrex_refsource_MISC
- www.veritas.com/content/support/en_US/security/VTS21-001mitrex_refsource_MISC
News mentions
1- Ransomware Tactics, Techniques, and Procedures in a Shifting Threat LandscapeMandiant Threat Intelligence · Mar 16, 2026