CVE-2021-34762: Cisco Firepower Management Center Software Authenticated Directory Traversal Vulnerability

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-27 · updated 2026-08-11
Weakness: CWE-26

Description

A vulnerability in the web-based management interface of Cisco Firepower Management Center (FMC) Software could allow an authenticated, remote attacker to perform a directory traversal attack on an affected device. The attacker would require valid device credentials. The vulnerability is due to insufficient input validation of the HTTPS URL by the web-based management interface. An attacker could exploit this vulnerability by sending a crafted HTTPS request that contains directory traversal character sequences to an affected device. A successful exploit could allow the attacker to read or write arbitrary files on the device.

Affected products

Cisco Firepower Management Center Virtual Appliance: 6.2.3, 6.4.0, 6.5.0, 6.6.1, 6.6.2, 6.6.3 (+4)
Cisco Firepower Threat Defense Software: before 6.4.0.13; from 6.5.0 before 6.6.5; from 6.7.0 before 6.7.0.3; from 7.0.0 before 7.0.1 — fixed in 6.4.0.13, 6.6.5, 6.7.0.3, 7.0.1
Cisco Sourcefire Defense Center: 6.2.3, 6.4.0, 6.5.0, 6.6.1, 6.6.2, 6.6.3 (+2)

How to fix

Upgrade to a fixed version: Cisco Firepower Threat Defense Software 6.4.0.13, 6.6.5, 6.7.0.3, 7.0.1. Check the vendor advisory for mitigations.

References

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