by Kastro
Paper/Archive/CVE-2026-20131

CVE-2026-20131

Cisco Cisco Secure Firewall Management Center (FMC) — Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability

KEV · due 22 Marransomware useEPSS 43%public exploitSSVC actCVSS 10.0
critical.is priorityof 100
100
CVSS 10.0 (CNA)10.0 / 10 × 3030.0In CISA KEV+3030.0EPSS percentile 98.7.987 × 2019.7Exploit: SSVC active+1010.0SSVC exploitation: active+1010.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Cisco Secure Firewall Management Center (FMC)7.0.0–CNA
Cisco Secure Firewall Management Center (FMC)7.0.0.1–CNA
Cisco Secure Firewall Management Center (FMC)7.0.1–CNA
Cisco Secure Firewall Management Center (FMC)7.1.0–CNA
Cisco Secure Firewall Management Center (FMC)6.4.0.13–CNA
Cisco Secure Firewall Management Center (FMC)7.0.1.1–CNA
Cisco Secure Firewall Management Center (FMC)6.4.0.14–CNA
Cisco Secure Firewall Management Center (FMC)7.1.0.1–CNA
Cisco Secure Firewall Management Center (FMC)7.0.2–CNA
Cisco Secure Firewall Management Center (FMC)6.4.0.15–CNA
Cisco Secure Firewall Management Center (FMC)7.2.0–CNA
Cisco Secure Firewall Management Center (FMC)7.0.2.1–CNA

Scores by source

cisco (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: active · Automatable: yes · Technical impact: total

References

refsec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-rce-NKhnULJhwriteupaws.amazon.com/blogs/security/amazon-threat-intelligence-teams-identify-interlock-ransomware-campaign-targeting-enterprise-firewallsrefcisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20131kevcisa.gov/known-exploited-vulnerabilities-catalog