Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L N N C H H H 10.0 .3123 98.1 YES
AFFECTED Product Versions Fixed Cisco Secure Firewall Management Center (FMC) 7.0.0 – —
TIMELINE Oct 8 Reserved by cisco Mar 19 Added to CISA KEV, remediation due 2026-03-22 Mar 19 Published (CNA: cisco)
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.
| Date | Event | Detail |
|---|---|---|
| October 8, 2025 | Reserved | Reserved by cisco |
| March 19, 2026 | KEV ADDED | Added to CISA KEV, remediation due 2026-03-22 |
| March 19, 2026 | Published | Published (CNA: cisco) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| Cisco | Cisco Secure Firewall Management Center (FMC) | — | 7.0.0 | — |
Authoritative record: CVE-2026-20131 at cve.org
Vendors: cisco
Weaknesses: CWE-502
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-20131 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.