CISA KEV catalog
Confirmed active exploitation.
Listed in CISA's catalog of Known Exploited Vulnerabilities: attackers are using it in real attacks. Patch it with priority.
- Name
- Veritas Backup Exec Agent Command Execution Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply updates per vendor instructions.
Description
An issue was discovered in Veritas Backup Exec before 21.2. The communication between a client and an Agent requires successful authentication, which is typically completed over a secure TLS communication. However, due to a vulnerability in the SHA Authentication scheme, an attacker is able to gain unauthorized access and complete the authentication process. Subsequently, the client can execute data management protocol commands on the authenticated connection. The attacker could use one of these commands to execute an arbitrary command on the system using system privileges.
Affected products
veritas: backup exec
References5
- www.veritas.com/content/support/en_US/security/VTS21-001#issue3 Vendor Advisory
- www.veritas.com/content/support/en_US/security/VTS21-001#issue3 Vendor Advisory
- packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-… ExploitThird Party AdvisoryVDB Entry
- packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-… ExploitThird Party AdvisoryVDB Entry
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=… US Government Resource
Metrics
- CVSS 3.1
-
8.8
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 24% percentile: 98 · as of 2 November 2026
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