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Analysis · May 20, 2026 · Colten Anderson

The backup agent on every server was ALPHV's way in

Veritas Backup Exec's agent listens on every machine it backs up. Three 2021 CVEs in it, CVE-2021-27876, 27877, and 27878, let ALPHV/BlackCat affiliates get in. Backup infrastructure isn't just a destruction target; its agents are an attack surface on every host.