Remote Command Execution in Cisco Secure Firewall Management Center Software
CVE-2026-20242

9.8CRITICAL

Key Information:

Vendor

Cisco
Status
Cisco Secure Firewall Management Center (fmc)
Vendor
CVE Published:
16 September 2026

Badges

👾 Exploit Exists

What is CVE-2026-20242?

A security vulnerability exists in the External Database Access feature of Cisco Secure Firewall Management Center Software, which could allow an unauthenticated remote attacker to execute arbitrary commands with root privileges on affected devices. This issue arises from the insecure deserialization of a user-supplied Java byte stream from hosts in the external database access configuration. An attacker with control over such a host can exploit this vulnerability by sending a maliciously crafted Java byte stream to the affected device's TCP port, thereby executing arbitrary commands and potentially escalating their privileges.

Affected Version(s)

Cisco Secure Firewall Management Center (FMC) 7.0.0

Cisco Secure Firewall Management Center (FMC) 7.0.0.1

Cisco Secure Firewall Management Center (FMC) 7.0.1

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.