High severity8.2CISA KEVNVD Advisory· Published Mar 1, 2021· Updated Jun 17, 2026
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
3cpe:2.3:a:veritas:backup_exec:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:veritas:backup_exec:*:*:*:*:*:*:*:*range: <21.2
- (no CPE)range: <21.2
- Veritas/Backup Execdescription
Patches
Vulnerability mechanics
References
3- packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.htmlnvdExploitThird Party AdvisoryVDB Entry
- www.veritas.com/content/support/en_US/security/VTS21-001nvdVendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalognvdUS Government Resource
News mentions
1- Ransomware Tactics, Techniques, and Procedures in a Shifting Threat LandscapeMandiant Threat Intelligence · Mar 16, 2026