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CVE-2026-20131

critical · 10Actively exploited

On the CISA Known Exploited Vulnerabilities catalog

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Added 2026-03-19Remediation due 2026-03-22

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.

10
CVSS
33.4%
EPSS (exploit prob.)
98th
EPSS percentile
2026-03-04
Published

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

Weaknesses

CWE-502

Affected products

VendorProductAffected versions
ciscosecure_firewall_management_center6.4.0.13
ciscosecure_firewall_management_center6.4.0.14
ciscosecure_firewall_management_center6.4.0.15
ciscosecure_firewall_management_center6.4.0.16
ciscosecure_firewall_management_center6.4.0.17
ciscosecure_firewall_management_center6.4.0.18
ciscosecure_firewall_management_center7.0.0
ciscosecure_firewall_management_center7.0.0.1
ciscosecure_firewall_management_center7.0.1
ciscosecure_firewall_management_center7.0.1.1
ciscosecure_firewall_management_center7.0.2
ciscosecure_firewall_management_center7.0.2.1
ciscosecure_firewall_management_center7.0.3
ciscosecure_firewall_management_center7.0.4
ciscosecure_firewall_management_center7.0.5
ciscosecure_firewall_management_center7.0.6
ciscosecure_firewall_management_center7.0.6.1
ciscosecure_firewall_management_center7.0.6.2
ciscosecure_firewall_management_center7.0.6.3
ciscosecure_firewall_management_center7.0.7
ciscosecure_firewall_management_center7.0.8
ciscosecure_firewall_management_center7.0.8.1
ciscosecure_firewall_management_center7.1.0
ciscosecure_firewall_management_center7.1.0.1
ciscosecure_firewall_management_center7.1.0.2
ciscosecure_firewall_management_center7.1.0.3
ciscosecure_firewall_management_center7.2.0
ciscosecure_firewall_management_center7.2.0.1
ciscosecure_firewall_management_center7.2.1
ciscosecure_firewall_management_center7.2.2
ciscosecure_firewall_management_center7.2.3
ciscosecure_firewall_management_center7.2.3.1
ciscosecure_firewall_management_center7.2.4
ciscosecure_firewall_management_center7.2.4.1
ciscosecure_firewall_management_center7.2.5
ciscosecure_firewall_management_center7.2.5.1
ciscosecure_firewall_management_center7.2.5.2
ciscosecure_firewall_management_center7.2.6
ciscosecure_firewall_management_center7.2.7
ciscosecure_firewall_management_center7.2.8

Check a specific version with /api/v1/cve/match.

References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-20131