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TI-2026-16527 Aliases CVE-2026-20343GHSA-mxj5-v55g-6rm4

Cisco Secure Firewall Management Center Software Information Disclosure and Disk Denial of Service Vulnerability

Priority MEDIUM 40CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

A vulnerability in a critical API for Cisco Secure FMC Software could allow an unauthenticated, remote attacker to download sensitive files and use unbounded disk space. This vulnerability exists because a critical API lacks authentication. An attacker could exploit this vulnerability by repeatedly invoking the API. A successful exploit could allow the attacker to download sensitive files that should be restricted and consume disk space so the device could become unresponsive, causing a DoS condition.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00658 51st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco Secure Firewall Management Center (FMC)7.3.0; 7.3.1; 7.3.1.1; 7.4.0; 7.4.1; 7.4.1.1; 7.3.1.2; 7.6.0; 7.4.2; 7.4.2.1; 7.7.0; 7.4.2.2; 7.6.1; 7.4.2.3; 7.6.2; 7.7.10; 7.6.2.1; 7.7.10.1; 7.4.2.4; 7.4.3; 7.6.3; 7.7.11; 7.6.4; 10.0.0; 7.4.4; 7.4.5; 7.7.12; 7.6.5; 7.4.6; 10.0.1; 7.4.7—No fix listedCNA
  • Cisco Secure Firewall Management Center (FMC) VendorCisco Affected 7.3.0; 7.3.1; 7.3.1.1; 7.4.0; 7.4.1; 7.4.1.1; 7.3.1.2; 7.6.0; 7.4.2; 7.4.2.1; 7.7.0; 7.4.2.2; 7.6.1; 7.4.2.3; 7.6.2; 7.7.10; 7.6.2.1; 7.7.10.1; 7.4.2.4; 7.4.3; 7.6.3; 7.7.11; 7.6.4; 10.0.0; 7.4.4; 7.4.5; 7.7.12; 7.6.5; 7.4.6; 10.0.1; 7.4.7 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*——Cisco
  • cpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:* Versions — — ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-20343
  2. 2026-10-03 Alias added: GHSA-mxj5-v55g-6rm4
  3. 2026-10-25 EPSS moved to the 50th–90th percentile
  4. 2026-10-25 Priority changed: LOW → MEDIUM

References

Other 1

  • TI-2026-74174 Arbitrary file write in Cisco Secure Email Gateway via AMP feature KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-53490 Cisco Catalyst SD-WAN Manager System Account Authorization Bypass Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-53489 Cisco Secure Email Gateway SQL Injection Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-53488 Cisco Identity Services Engine Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-16388 Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-16344 Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 10.0
See all 7059 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences