CVE-2026-20131 PUBLISHED

Assigner: cisco
Reserved: 08.10.2025 Published: 04.03.2026 Updated: 05.03.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 10

Product Status

Vendor Cisco
Product Cisco Secure Firewall Management Center (FMC)
Versions
  • Version 6.4.0.13 is affected
  • Version 6.4.0.14 is affected
  • Version 6.4.0.15 is affected
  • Version 6.4.0.16 is affected
  • Version 6.4.0.17 is affected
  • Version 6.4.0.18 is affected
  • Version 7.0.0 is affected
  • Version 7.0.0.1 is affected
  • Version 7.0.1 is affected
  • Version 7.0.1.1 is affected
  • Version 7.0.2 is affected
  • Version 7.0.2.1 is affected
  • Version 7.0.3 is affected
  • Version 7.0.4 is affected
  • Version 7.0.5 is affected
  • Version 7.0.6 is affected
  • Version 7.0.6.1 is affected
  • Version 7.0.6.2 is affected
  • Version 7.0.6.3 is affected
  • Version 7.0.7 is affected
  • Version 7.0.8 is affected
  • Version 7.0.8.1 is affected
  • Version 7.1.0 is affected
  • Version 7.1.0.1 is affected
  • Version 7.1.0.2 is affected
  • Version 7.1.0.3 is affected
  • Version 7.2.0 is affected
  • Version 7.2.1 is affected
  • Version 7.2.2 is affected
  • Version 7.2.0.1 is affected
  • Version 7.2.3 is affected
  • Version 7.2.3.1 is affected
  • Version 7.2.4 is affected
  • Version 7.2.4.1 is affected
  • Version 7.2.5 is affected
  • Version 7.2.5.1 is affected
  • Version 7.2.6 is affected
  • Version 7.2.7 is affected
  • Version 7.2.5.2 is affected
  • Version 7.2.8 is affected
  • Version 7.2.8.1 is affected
  • Version 7.2.9 is affected
  • Version 7.2.10 is affected
  • Version 7.2.10.2 is affected
  • Version 7.2.10.1 is affected
  • Version 7.3.0 is affected
  • Version 7.3.1 is affected
  • Version 7.3.1.1 is affected
  • Version 7.3.1.2 is affected
  • Version 7.4.0 is affected
  • Version 7.4.1 is affected
  • Version 7.4.1.1 is affected
  • Version 7.4.2 is affected
  • Version 7.4.2.1 is affected
  • Version 7.4.2.2 is affected
  • Version 7.4.2.3 is affected
  • Version 7.4.2.4 is affected
  • Version 7.4.3 is affected
  • Version 7.4.4 is affected
  • Version 7.4.5 is affected
  • Version 7.6.0 is affected
  • Version 7.6.1 is affected
  • Version 7.6.2 is affected
  • Version 7.6.2.1 is affected
  • Version 7.6.3 is affected
  • Version 7.6.4 is affected
  • Version 7.7.0 is affected
  • Version 7.7.10 is affected
  • Version 7.7.10.1 is affected
  • Version 7.7.11 is affected
  • Version 10.0.0 is affected

Exploits

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References

Problem Types

  • Deserialization of Untrusted Data cwe