SARA / Free Tools / CVE / CVE-2021-27876

CVE-2021-27876 — Veritas Backup Exec Agent File Access Vulnerability

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 attac

CVSS
8.1 HIGH
EPSS
99.00% (top 23.40%)
CWE
Published
2021-03-01T21:49:06.000Z
Last modified
2025-10-21T23:25:53.626Z
CVSS vector
CVSS:3.1/AC:L/AV:N/A:N/C:H/I:H/PR:L/S:U/UI:N
CISA KEV — Actively Exploited
Added to KEV
2023-04-07
BOD 22-01 due
2023-04-28
Ransomware use
Known

01What is this vulnerability?

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…

02Affected products

VendorProductVersions
na / n/an/a

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2023-04-07. Ransomware use: Known.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

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07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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