CVE-2021-34751 | Cisco Firepower Management Center Software Configuration Information Disclosure Vulnerability

A vulnerability in the administrative web-based GUI configuration manager of Cisco Firepower Management Center (FMC) Software could allow an authenticated, remote attacker to access sensitive configuration information. The attacker would require low privilege credentials on an affected device. This vulnerability exists because of improper encryption of sensitive information stored within the GUI configuration manager. An attacker could exploit this vulnerability by logging into the GUI of Cisco FMC Software and navigating to certain sensitive configurations. A successful exploit could allow the attacker to view sensitive configuration parameters in clear text.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.[[Publication_URL{Layout()}]]This advisory is part of the October 2021 release of the Cisco ASA, FTD, and FMC Security Advisory Bundled publication. For a complete list of the advisories and links to them, see . 

Published: 2024-11-15 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]

Conclusion & alert: CVE-2021-34751 is rated Low Risk (23.7/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.27%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-34751

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.19% 0.27% +0.08%
2 2026-04-06 0.14% 0.19% +0.05%
3 2025-12-24 0.14%

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-34751

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
2.8 1.4 [email protected]

Weakness enumeration for CVE-2021-34751

Affected software / configurations for CVE-2021-34751

Vendor Product Version Raw CPE
cisco secure_firewall_management_center < 6.4.0.13 cpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*
cisco secure_firewall_management_center >= 6.5.0, < 6.6.5.1 cpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*
cisco secure_firewall_management_center >= 6.7.0, < 6.7.0.3 cpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*
cisco secure_firewall_management_center 7.0.0 cpe:2.3:a:cisco:secure_firewall_management_center:7.0.0:*:*:*:*:*:*:*

References for CVE-2021-34751

cvelogic Threat Intelligence