Cisco Secure Firewall Management Center Software Information Disclosure and Disk Denial of Service Vulnerability (CVE-2026-20343) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-20343

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

Answer in brief

CVE-2026-20343 records a Unknown severity vulnerability in Cisco Secure Firewall Management Center Software Information Disclosure and Disk Denial of Service Vulnerability. The current sources do not mark it as known exploited. The current feed maps Cisco/Cisco Secure Firewall Management Center (FMC) (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 16, 2026Updated Sep 16, 2026Source checked Sep 16, 2026First seen by HOL Sep 16, 2026Material review Sep 16, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Cisco/Cisco Secure Firewall Management Center (FMC) (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Cisco/Cisco Secure Firewall Management Center (FMC)generic	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	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Cisco/Cisco Secure Firewall Management Center (FMC).
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 16, 2026

Sources and claim methodology

Source referencesec.cloudapps.cisco.com

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.