CVE-2026-20131
Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability
Basic Information
- CVE State
- PUBLISHED
- Reserved Date
- October 08, 2025
- Published Date
- March 04, 2026
- Last Updated
- March 25, 2026
- Vendor
- Cisco
- Product
- Cisco Secure Firewall Management Center (FMC)
- 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.
- Tags
- Exploitation
- active
- Automatable
- Yes
- Technical Impact
- total
- Exploited in the Wild
- Yes (2026-06-01 12:10:30 UTC) Source
cisa
CVSS Scores
CVSS v3.1
10.0 - CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
SSVC Information
Exploit Status
Known Exploited Vulnerability Information
| Source | Added Date |
|---|---|
| CVE | 2026-06-01 12:10:30 UTC |
Timeline
-
CVE ID Reserved
-
CVE Published to Public
-
Added to KEVIntel