AEGLIX vulnerability intelligence
CVE-2021-27876
HIGH · CVSS 8.1 · Analyzed
Published: 2021-03-01 · Updated: 2026-06-17 · Source: NVD
Vulnerability overview
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.
Severity and scoring
- CVSS score
- 8.1 · HIGH
- CVSS version
- 3.1
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Weaknesses
- NVD-CWE-noinfo
CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.
Known exploitation and remediation
Listed in CISA’s Known Exploited Vulnerabilities catalog.
- Affected product
- Veritas · Backup Exec Agent
- Added to catalog
- 2023-04-07
- Required action
- Apply updates per vendor instructions.
- CISA remediation due date
- 2023-04-28
CISA deadlines apply to the organizations covered by its directives. Confirm your own remediation requirements.
Verify affected versions and patch availability in the vendor advisory before making changes.
Affected products and versions
cpe:2.3:a:veritas:backup_exec:*:*:*:*:*:*:*:*
Before (exclusive): 21.2
These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.
Advisories and references
- http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html
Exploit · Third Party Advisory · VDB Entry
- https://www.veritas.com/content/support/en_US/security/VTS21-001#issue2
Vendor Advisory
- http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html
Exploit · Third Party Advisory · VDB Entry
- https://www.veritas.com/content/support/en_US/security/VTS21-001#issue2
Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27876
US Government Resource