CVE-2021-27876 (GCVE-0-2021-27876)
Vulnerability from cvelistv5 – Published: 2021-03-01 21:49 – Updated: 2025-10-21 23:25Summary
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)
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2023-12-22 05:01 UTC
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.veritas.com/content/support/en_US/sec… | x_refsource_MISC |
| http://packetstormsecurity.com/files/168506/Verit… | x_refsource_MISC |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: afd2a4d6-0430-454a-aae5-5a34c214fffa
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
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 711f8c9c-0111-420e-96a2-3a8e49247012
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. The communication between a client and an Agent requires successful authentication,... | Affected: Veritas / Backup Exec | CVSS: 8.1 (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. The communication between a client and an Agent requires successful authentication,... |
| Vendor | Veritas |
| Product | Backup Exec |
| Added Date | 2023-04-07T00:00:00.000Z |
| Cvss Score | 8.1 |
| 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: 2026-06-23 11:14 UTC
| Updated: 2026-06-23 11:14 UTC
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"vectorString": "CVSS:3.1/AC:L/AV:N/A:N/C:H/I:H/PR:L/S:U/UI:N",
"version": "3.1"
}
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "n/a"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://www.veritas.com/content/support/en_US/security/VTS21-001#issue2",
"refsource": "MISC",
"url": "https://www.veritas.com/content/support/en_US/security/VTS21-001#issue2"
},
{
"name": "http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html",
"refsource": "MISC",
"url": "http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2021-27876",
"datePublished": "2021-03-01T21:49:06.000Z",
"dateReserved": "2021-03-01T00:00:00.000Z",
"dateUpdated": "2025-10-21T23:25:53.626Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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