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CVE-2026-20343NVD

Vulnerability 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.
Severity Level
HIGH(7.5)
Published Date
Sep 16, 2026
Last Modified
Sep 18, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.45%Probability
Root Weakness (CWE)
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v3.1 Base Metrics — Score 7.5 (HIGH)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.3.0
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.3.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.3.1.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.0
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.1.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.3.1.2
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.0
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.0
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2.2
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2.3
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.2
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.10
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.2.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.10.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.2.4
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.3
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.3
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.11
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.4
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 10.0.0
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.4
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.5
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.7.12
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.6.5
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.6
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 10.0.1
  • Cisco Cisco Secure Firewall Management Center (FMC) >= 7.4.7
Patched Versions
Not provided by cveorg for this CVE.
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♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
⚙️Custom EPSS — Filter noise, focus on risk.
💬Webhooks — Slack & Teams integration.
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