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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.

• https://www.veritas.com/content/support/en_US/security/VTS21-001#issue1 x_refsource_MISC
• http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html x_refsource_MISC
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27877 government-resource