Vulnerability Monitor

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CVE-2021-34761

A vulnerability in Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite or append arbitrary data to system files using root-level privileges. The attacker must have administrative credentials on the device. This vulnerability is due to incomplete validation of user input for a specific CLI command. An attacker could exploit this vulnerability by authenticating to the device with administrative privileges and issuing a CLI command with crafted user parameters. A successful exploit could allow the attacker to overwrite or append arbitrary data to system files using root-level privileges.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 4.4, requiring local system access to exploit with relatively low complexity without requiring user interaction . The vulnerability impacts integrity (unauthorized modifications), for affected systems. Impacting 3 products from cisco, from cisco, from cisco organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-10-27T19:15:08.003

Last Modified

2024-11-21T06:11:08.453

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 4.4 (MEDIUM)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:N/I:C/A:C

  • Access Vector: LOCAL
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: NONE
  • Integrity Impact: COMPLETE
  • Availability Impact: COMPLETE
Exploitability Score

3.9

Impact Score

9.2

Weaknesses
  • Type: Secondary
    CWE-73
  • Type: Primary
    CWE-668
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application cisco firepower_management_center_virtual_appliance 6.2.3 Yes
Application cisco firepower_management_center_virtual_appliance 6.4.0 Yes
Application cisco firepower_management_center_virtual_appliance 6.6.1 Yes
Application cisco firepower_management_center_virtual_appliance 6.7.0 Yes
Application cisco firepower_management_center_virtual_appliance 7.0.0 Yes
Application cisco firepower_management_center_virtual_appliance 7.1.0 Yes
Application cisco firepower_threat_defense < 6.4.0.13 Yes
Application cisco firepower_threat_defense < 6.6.5 Yes
Application cisco firepower_threat_defense < 6.7.0.3 Yes
Application cisco firepower_threat_defense < 7.0.1 Yes
Application cisco sourcefire_defense_center 6.2.3 Yes
Application cisco sourcefire_defense_center 6.4.0 Yes
Application cisco sourcefire_defense_center 6.6.1 Yes
Application cisco sourcefire_defense_center 6.7.0 Yes
Application cisco sourcefire_defense_center 7.0.0 Yes
Application cisco sourcefire_defense_center 7.1.0 Yes
References

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cisco's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.