CVE-2021-27877An 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. 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.
- CVSS
- 8.2 HIGH (v3.1, CNA)CVSS:3.1/AC:L/AV:N/A:N/C:H/I:L/PR:N/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)
- 64.91% (percentile 99)
- 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#issue1x-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-2021-27877us-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.