Cisco Firepower Threat Defense Software CLI Arbitrary File Write Vulnerability
Summary
| CVE | CVE-2021-34761 |
|---|---|
| State | PUBLISHED |
| Assigner | cisco |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2021-10-27 19:15:08 UTC |
| Updated | 2026-08-11 19:33:44 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.1 6 MEDIUM from [email protected]
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Problem Types: CWE-73 | CWE-668 | CWE-73 CWE-73
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 6 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H |
| 3.1 | [email protected] | Secondary | 4.4 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N |
| 3.1 | CNA | DECLARED | 4.4 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N |
| 2.0 | [email protected] | Primary | 6.6 | AV:L/AC:L/Au:N/C:N/I:C/A:C |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
HighUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
HighAvailability
HighCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
CVSS v2.0 Breakdown
Access Vector
LocalAccess Complexity
LowAuthentication
NoneConfidentiality
NoneIntegrity
CompleteAvailability
CompleteAV:L/AC:L/Au:N/C:N/I:C/A:C
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Cisco | Firepower Management Center Virtual Appliance | 6.2.3 | All | All | All |
| Application | Cisco | Firepower Management Center Virtual Appliance | 6.4.0 | All | All | All |
| Application | Cisco | Firepower Management Center Virtual Appliance | 6.6.1 | All | All | All |
| Application | Cisco | Firepower Management Center Virtual Appliance | 6.7.0 | All | All | All |
| Application | Cisco | Firepower Management Center Virtual Appliance | 7.0.0 | All | All | All |
| Application | Cisco | Firepower Management Center Virtual Appliance | 7.1.0 | All | All | All |
| Application | Cisco | Secure Firewall Threat Defense | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Cisco | Cisco Firepower Threat Defense Software | affected n/a | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Cisco Firepower Threat Defense Software CLI Arbitrary File Write Vulnerability | af854a3a-2127-422b-91ae-364da2661108 | tools.cisco.com | Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
Exploits
CNA: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
Legacy QID Mappings
- 317098 Cisco Firepower Threat Defense (FTD) Software Command Line Interface (CLI) Arbitrary File Write Vulnerability (cisco-sa-ftd-file-write-SHVcmQVc)