CVE-2021-27876

Known Exploited Public Exploit

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.

8.1

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.64%

KEV Since

Vendor Advisory veritas.com

Affected: n/a n/a

References

Link	Tags
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	third party advisory vdb entry exploit

Frequently Asked Questions

What is the severity of CVE-2021-27876?: CVE-2021-27876 has been scored as a high severity vulnerability.
How to fix CVE-2021-27876?: To fix CVE-2021-27876, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-27876 being actively exploited in the wild?: It is confirmed that CVE-2021-27876 is actively exploited. Be extra cautious if you are using vulnerable components. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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