CVE-2021-27876 (GCVE-0-2021-27876)

Vulnerability from cvelistv5 – Published: 2021-03-01 21:49 – Updated: 2025-10-21 23:25
VLAI? CISA KEV
Summary
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.
Severity ?
8.1 (High)
CVSS:3.1/AC:L/AV:N/A:N/C:H/I:H/PR:L/S:U/UI:N
CWE
  • n/a
Assigner
References
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: afd2a4d6-0430-454a-aae5-5a34c214fffa

Vulnerability ID: CVE-2021-27876

Status: Confirmed

Status Updated: 2023-04-07 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2023-04-07
Asserted: 2023-04-07
Scope
Notes: KEV entry: Veritas Backup Exec Agent File Access Vulnerability | Affected: Veritas / Backup Exec Agent | Description: Veritas Backup Exec (BE) Agent contains a file access vulnerability that could allow an attacker to specially craft input parameters on a data management protocol command to access files on the BE Agent machine. | Required action: Apply updates per vendor instructions. | Due date: 2023-04-28 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://www.veritas.com/support/en_US/security/VTS21-001; https://nvd.nist.gov/vuln/detail/CVE-2021-27876
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-287
Feed CISA Known Exploited Vulnerabilities Catalog
Product Backup Exec Agent
Due Date 2023-04-28
Date Added 2023-04-07
Vendorproject Veritas
Vulnerabilityname Veritas Backup Exec Agent File Access Vulnerability
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 13:25 UTC | Updated: 2026-02-06 07:53 UTC
Show details on NVD website
To clipboard 

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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