CVE-2021-27877 (GCVE-0-2021-27877)

Vulnerability from cvelistv5 – Published: 2021-03-01 21:49 – Updated: 2025-10-21 23:25
VLAI CISA KEVIntel
Summary
An issue was discovered in Veritas Backup Exec before 21.2. It supports multiple authentication schemes: SHA authentication is one of these. This authentication scheme is no longer used in current versions of the product, but hadn't yet been disabled. An attacker could remotely exploit this scheme to gain unauthorized access to an Agent and execute privileged commands.
Severity
8.2 (High)
CVSS:3.1/AC:L/AV:N/A:N/C:H/I:L/PR:N/S:U/UI:N
SSVC
Exploitation: active Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 69c2bbb8-9db3-478c-bfac-40f615b5d907

Vulnerability ID: CVE-2021-27877

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 Improper Authentication Vulnerability | Affected: Veritas / Backup Exec Agent | Description: Veritas Backup Exec (BE) Agent contains an improper authentication vulnerability that could allow an attacker unauthorized access to the BE Agent via SHA authentication scheme. | 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-2021-27877
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 Improper Authentication Vulnerability
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 12:27 UTC | Updated: 2026-02-06 07:17 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4d2a3694-8d2f-40f9-be9d-9864a07ab493

Vulnerability ID: CVE-2021-27877

Status: Confirmed

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

Exploited: Yes

Timestamps
First Seen: 2023-04-07
Asserted: 2023-04-07
Scope
Notes: KEVIntel entry: An issue was discovered in Veritas Backup Exec before 21.2. It supports multiple authentication schemes: SHA authentication is one of these. This... | Affected: Veritas / Backup Exec | CVSS: 8.2 (HIGH) | Used in malware: yes | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Confirmed Compromise

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title An issue was discovered in Veritas Backup Exec before 21.2. It supports multiple authentication schemes: SHA authentication is one of these. This...
Vendor Veritas
Product Backup Exec
Added Date 2023-04-07T00:00:00.000Z
Cvss Score 8.2
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware yes
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-19 12:46 UTC | Updated: 2026-06-19 12:46 UTC
Show details on NVD website
To clipboard 

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}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.