PoC Index

CVE-2021-27876

KEV RANSOMWAREHIGH 8.1EPSS 13.5%

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.

CVSS v3.1
8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v3.1
8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v2.0
7.5 HIGHAV:N/AC:L/Au:S/C:C/I:P/A:N
EPSS
13.52% chance of exploitation in the next 30 days, 96th percentile
CISA KEV
added 2023-04-07, used in ransomware campaigns
Published
2021-03-01
Updated
2025-10-21

Proof-of-concept exploits (2)

Metasploit modules (1)

References

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