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CVE-2026-20342

Cisco Secure Firewall Management Center Software Low Privileged Arbitrary File Download Vulnerability

Published: Sep 16, 2026Updated: Sep 18, 2026 Sources: CVE List NVDCWE-639
7.7HIGH
NVD MITRE
EPSS Score
0.5%
Top 55.1%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
No Fix Available
Self-Check
Not available

Description

A vulnerability in a specific file download API of Cisco Secure FMC Software could allow an authenticated, remote attacker to download arbitrary files from an affected system. This vulnerability exists because user input is not being sanitized. An attacker could exploit this vulnerability by sending a crafted HTTPS request. A successful exploit could allow the attacker to download arbitrary files from the affected system. To exploit this vulnerability, the attacker must have valid credentials for a user account with at least the role of Security Analyst (read-only).

In plain language

AI Act now

Cisco Secure Firewall Management Center has a flaw that lets a low-level account download files it should not see, so businesses using it should act now.

Executive summary

Authenticated arbitrary file read through the Cisco Secure Firewall Management Center file-download API due to improper authorization/input handling (CWE-639).

If affected, business impact
Sensitive file exposureConfiguration theftNetwork information exposureFollow-on system compromise

What to do now

  1. Check whether your organization runs Cisco Secure Firewall Management Center and identify all accounts with Security Analyst or higher access.
  2. There is no published fixed version yet; ask Cisco or your support provider for the official remediation and upgrade guidance for CVE-2026-20342.
  3. Until a fix is available, restrict Security Analyst access to trusted staff, remove unused accounts, and review recent file-download activity.
  4. Rotate passwords and access tokens if you find unexpected file downloads or suspicious account use.
May need vendor / contractor work

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-639

Affected Products

Cisco
commercial·USaka cisco systems inc., cisco systems
Cisco Secure Firewall Management Center (FMC)
Networking Infrastructure

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Is your org exposed to CVE-2026-20342?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-mulivulns-4PsnFwvx
sec.cloudapps.cisco.com
News mentions
1

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