CVE-2021-27876An issue was discovered in Veritas Backup Exec before 21.2.
Updated under an hour ago ()
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It affects veritas backup_exec. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Apr 7, 2023; federal agencies had to remediate by Apr 28, 2023, and it is known to be used in ransomware. Treat that date as your deadline.
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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. By using crafted input parameters in one of these commands, an attacker can access an arbitrary file on the system using System privileges.
- CVSS
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AC:L/AV:N/A:N/C:H/I:H/PR:L/S:U/UI:N
- Weakness (CWE)
- Not given
- Known exploited
- Added to CISA KEV Apr 7, 2023; federal remediation due Apr 28, 2023; known ransomware useApply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 13.52% (percentile 96)
- Assigned by
- mitre
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
veritas backup_exec veritas:backup_exec | before 21.2 | NVD |
References
- https://www.veritas.com/content/support/en_US/security/VTS21-001#issue2x-refsource-misc, vendor-advisory
- http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.htmlx-refsource-misc, exploit, third-party-advisory, vdb-entry
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27876us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.