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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.
Use Veritas vendor hub and Backup Exec product page to widen CVE-2021-27877 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2021-27878, CVE-2021-27876 and CVE-2017-8895 for nearby disclosures in the same product family.