CVE-2021-27876 KEV
8.1
HIGH · CVSS 3.1 · EPSS 13.5% (pctl 96)
Patch first
On CISA KEV — known exploited in the wild, due 2023-04-28.
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. By using crafted input parameters in one of these commands, an attacker can access an arbitrary file on the system using System privileges.
Scoring
| CVSS | 8.1 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| EPSS | 13.52% — more likely to be exploited than 96% of all CVEs |
| On CISA KEV | yes — remediate by 2023-04-28 |
| Public exploit | none known |
| Published | 2021-03-01 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Veritas Backup Exec Agent File Access Vulnerability |
|---|---|
| Added | 2023-04-07 |
| Due | 2023-04-28 |
| Vendor / product | Veritas / Backup Exec Agent |
| Ransomware use | known |
Affected (1)
| Vendor | Product |
|---|---|
| veritas | backup exec |
References
- http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html
- https://www.veritas.com/content/support/en_US/security/VTS21-001#issue2
- http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html
- https://www.veritas.com/content/support/en_US/security/VTS21-001#issue2
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27876
→ the Explorer · watch your stack · NVD