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Vulnerabilities

Vulnerability · CVE-2026-20242

ZDI-26-709: Cisco Secure Firewall Management Center CommandSinkRmi Deserialization of Untrusted Data Remote Code Execution Vulnerability

Published Sep 16, 2026 · ZDI-26-709: Cisco Secure Firewall

Check if you run it

No confirmed exploitation is on record for CVE-2026-20242. EPSS is 0.64%. Act only if a listed version of ZDI-26-709: Cisco Secure Firewall is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (ZDI-26-709: Cisco Secure Firewall).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.64%
Remediation
Not established
Affected products
See sources for product scope

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Cisco Secure Firewall Management Center. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.1. The following CVEs are assigned: CVE-2026-20242.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-20242

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-20242. EPSS is 0.64%. Act only if a listed version of ZDI-26-709: Cisco Secure Firewall is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.64%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 16, 2026 · Catalog

    Detected

    This vulnerability allows remote attackers to execute arbitrary code on affected installations of Cisco Secure Firewall Management Center. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.1. The following CVEs are assigned: CVE-2026-20242.

Sources

  • CVE.orgVulnerability recordCVE-2026-20242

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20242

    30-day exploitation probability 0.6%

    first.org
  • Zero Day InitiativeCoordinated disclosureZDI-26-709

    This vulnerability allows remote attackers to execute arbitrary code on affected installations of Cisco Secure Firewall Management Center. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.1. The following CVEs are assigned: CVE-2026-20242.

    zerodayinitiative.com

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.