CVE-2021-27878 KEV
8.8
HIGH · CVSS 3.1 · EPSS 24% (pctl 98)
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. The attacker could use one of these commands to execute an arbitrary command on the system using system privileges.
Scoring
| CVSS | 8.8 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 23.95% — more likely to be exploited than 98% 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 Command Execution 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#issue3
- http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html
- https://www.veritas.com/content/support/en_US/security/VTS21-001#issue3
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27878
→ the Explorer · watch your stack · NVD