Actively exploited · Published Mar 1, 2021 · Assigned by mitre
CVE-2021-27877
High 8.2 Exploited Ransomware
In plain English
A high-severity security flaw in Backup Exec Agent from Veritas. Attackers are actively exploiting it in the wild (listed by CISA on April 7, 2023). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 64.9% (higher than 99.3% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, Nuclei, public proof-of-concept code. Apply updates per vendor instructions.
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Apr 28, 2023.
Official 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.
Affected products (as reported)
References
- 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