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CVE-2026-20316

MEDIUM 5.3 KNOWN EXPLOITED RANSOMWARE ALL-YEARS

Published 2026-07-29 · Last modified 2026-09-16 · cisco · NVD: Analyzed

A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to log in to an affected device using a low-privileged account to access sensitive data within the impacted systems. This vulnerability is due to the presence of static user credentials for a low-privileged account. An attacker could exploit this vulnerability by using the account to log in to an affected system. A successful exploit could allow the attacker to log in to the affected system and access sensitive data as the low-privileged user.  Note: If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.   Cisco has assigned this security advisory a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that this vulnerability can be used with other Cisco Secure FMC Software vulnerabilities to elevate privileges.

ACTIVELY EXPLOITED

Confirmed exploited in the wild — in CISA KEV since 2026-07-29, linked to ransomware campaigns. Patch or mitigate now.

Exploitation likelihood

35.1%chance of exploitation in 30 days · 98th percentile

● In CISA KEV (2026-07-29)○ Catalogued PoC◆ SSVC: exploitation active, automatable yes

Impact if exploited

5.3CVSS 3.1 · MEDIUM · CNA

  • ConfidentialityLow
  • IntegrityNone
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

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Affected

Vendors Cisco

Products Cisco Secure Firewall Management Center (Fmc) Secure Firewall Management Center

Weakness (CWE)

  • CWE-259: Use of Hard-coded Password

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References and research data (JSON)

Additional exploitation reports

Source-specific reports, separate from CISA KEV. Repeated observations from one source are not independent confirmations.

Known Affected Software Configurations

VendorProductVersion range
CiscoSecure Firewall Management Center≥ 7.0.0 and ≤ 7.0.9
CiscoSecure Firewall Management Center≥ 7.2.0 and ≤ 7.2.11
CiscoSecure Firewall Management Center≥ 7.3.0 and ≤ 7.3.1.2
CiscoSecure Firewall Management Center≥ 7.4.0 and ≤ 7.4.7
CiscoSecure Firewall Management Center≥ 7.6.0 and ≤ 7.6.5
CiscoSecure Firewall Management Center≥ 7.7.0 and ≤ 7.7.12
CiscoSecure Firewall Management Center≥ 10.0.0 and ≤ 10.0.1

All CVSS metrics

  • MEDIUM 5.3 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
  • MEDIUM 5.3 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS