CVE-2026-20131Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability
Updated under an hour ago ()
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It affects Cisco Secure Firewall Management Center (FMC) and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Mar 19, 2026; federal agencies had to remediate by Mar 22, 2026, and it is known to be used in ransomware. Treat that date as your deadline.
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A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to execute arbitrary Java code as root on an affected device. This vulnerability is due to insecure deserialization of a user-supplied Java byte stream. An attacker could exploit this vulnerability by sending a crafted serialized Java object to the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary code on the device and elevate privileges to root. Note: If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.
- CVSS
- 10.0 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-502
- Known exploited
- Added to CISA KEV Mar 19, 2026; federal remediation due Mar 22, 2026; known ransomware useApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 43.17% (percentile 99)
- Assigned by
- cisco
- NVD analysis
- Analyzed
- Record last updated
- Aug 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Cisco Cisco Secure Firewall Management Center (FMC) cisco:secure_firewall_management_center_fmc (from the name) | 7.0.0; 7.0.0.1; 7.0.1; 7.1.0; 6.4.0.13; 7.0.1.1; 6.4.0.14; 7.1.0.1; and 62 more ranges | CNA record |
cisco secure_firewall_management_center cisco:secure_firewall_management_center | 6.4.0.13; 6.4.0.14; 6.4.0.15; 6.4.0.16; 6.4.0.17; 6.4.0.18; 7.0.0; 7.0.0.1; and 63 more ranges | NVD |
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-rce-NKhnULJhvendor-advisory
- https://aws.amazon.com/blogs/security/amazon-threat-intelligence-teams-identify-interlock-ransomware-campaign-targeting-enterprise-firewalls/technical-description
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20131us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.