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CVE-2021-1126: Cisco Firepower Management Center Information Disclosure Vulnerability

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-01-13 · updated 2026-06-17
• Weakness: CWE-256

Description

A vulnerability in the storage of proxy server credentials of Cisco Firepower Management Center (FMC) could allow an authenticated, local attacker to view credentials for a configured proxy server. The vulnerability is due to clear-text storage and weak permissions of related configuration files. An attacker could exploit this vulnerability by accessing the CLI of the affected software and viewing the contents of the affected files. A successful exploit could allow the attacker to view the credentials that are used to access the proxy server.

Affected products

• Cisco Firepower Management Center: before 6.7.0 — fixed in 6.7.0

How to fix

Upgrade to a fixed version: Cisco Firepower Management Center 6.7.0. Check the vendor advisory for mitigations.

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-infodisc-RJdktM6f
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-infodisc-RJdktM6f

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