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CVE-2026-20131Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability

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.

Exploited in the wild

CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data Vulnerability.

Added
19 Mar 2026
Fix due (US federal)
22 Mar 2026
Used by ransomware
Known

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

ENISA's EU Vulnerability Database lists it as exploited, from CISA's KEV, since 19 Mar 2026.

Public exploit

An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: it is being exploited.

Timeline

  1. ID reserved

    By cisco

  2. · 5 months later

    Published

  3. · 15 days later

    Added to CISA KEV

    Known exploited, also by ransomware

  4. · 5 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-20131, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1Critical10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVDNVD · Analyzed3.1Critical10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS (exploitation in 30 days)
44.4% · top 1.2% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: active · Automatable: yes · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 10.0.

Affected products

  • Cisco · Cisco Secure Firewall Management Center (FMC)

    • affected 7.0.0
    • affected 7.0.0.1
    • affected 7.0.1
    • affected 7.1.0
    • affected 6.4.0.13
    • affected 7.0.1.1
    • affected 6.4.0.14
    • affected 7.1.0.1
    • affected 7.0.2
    • affected 6.4.0.15
    • affected 7.2.0
    • affected 7.0.2.1
    • affected 7.0.3
    • affected 7.1.0.2
    • affected 7.2.0.1
    • affected 7.0.4
    • affected 7.2.1
    • affected 7.0.5
    • affected 6.4.0.16
    • affected 7.3.0
    • affected 7.2.2
    • affected 7.3.1
    • affected 7.2.3
    • affected 7.1.0.3
    • affected 7.2.3.1
    • affected 7.2.4
    • affected 7.0.6
    • affected 7.2.4.1
    • affected 7.2.5
    • affected 7.3.1.1
    • affected 7.4.0
    • affected 6.4.0.17
    • affected 7.0.6.1
    • affected 7.2.5.1
    • affected 7.4.1
    • affected 7.2.6
    • affected 7.4.1.1
    • affected 7.0.6.2
    • affected 6.4.0.18
    • affected 7.2.7
    • and 30 more

What to do

Exploitation: In March 2026, the Cisco Product Security Incident Response Team (PSIRT) became aware of attempted exploitation of this vulnerability. Cisco continues to strongly recommend that customers upgrade to a fixed software release to remediate this vulnerability.

References

References3

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-20131 badge
[![CVE-2026-20131](https://cveledger.app/badge/CVE-2026-20131.svg)](https://cveledger.app/cve/CVE-2026-20131)

Record last updated .