Vulnerability details
CVE-2026-20131
Actively exploited
Cisco Secure Firewall Management Center
Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability
CVSS 3.1
10.0Critical
Official description
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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 10.0Critical | 3.1 | CVEProject cvelistV5 (CNA) (cisco) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Cisco | Cisco Secure Firewall Management Center (FMC) | 10.0.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 6.4.0.13 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 6.4.0.14 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 6.4.0.15 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 6.4.0.16 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 6.4.0.17 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 6.4.0.18 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.0.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.1.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.2.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.4 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.5 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.6 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.6.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.6.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.6.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.7 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.8 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.0.8.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.1.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.1.0.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.1.0.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.1.0.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.0.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.10 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.10.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.10.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.3.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.4 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.4.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.5 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.5.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.5.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.6 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.7 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.8 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.8.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.2.9 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.3.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.3.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.3.1.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.3.1.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.4.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.4.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.4.1.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.4.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.4.2.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.4.2.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.4.2.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.4.2.4 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.4.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.4.4 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.4.5 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.6.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.6.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.6.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.6.2.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.6.4 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.7.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.7.10 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.7.10.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 7.7.11 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-rce-NKhnULJh
- https://aws.amazon.com/blogs/security/amazon-threat-intelligence-teams-identify-interlock-ransomware-campaign-targeting-enterprise-firewalls/ third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20131 government-resource
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Details
- Published
- 2026-03-04
- Last updated
- 2026-08-14
- State
- Published
- Assigner (CNA)
- cisco
- Kolun priority
- 90 · Critical
CISA KEV catalog
- Date added
- 2026-03-19
- Due date
- 2026-03-22
- Used in ransomware
- Yes
Exploit prediction (EPSS)
44.43%
Probability of exploitation in 30 days
98.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-502Deserialization of Untrusted Data