CVE-2021-27876
CVSS v3
8.1
HIGH
EPSS Score
1.0 %
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
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.
CISA Known Exploited Vulnerability
- Date Added
- 2023-04-07
- Patch Due Date
- 2023-04-28
- Ransomware Use
- Known
Technical details
- Published
- 2021-03-01
Frequently asked questions
What is CVE-2021-27876?
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.
Is CVE-2021-27876 actively exploited?
Yes. CVE-2021-27876 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2023-04-28.
What is the CVSS score for CVE-2021-27876?
CVE-2021-27876 has a CVSS v3 base score of 8.1 (HIGH severity).
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