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9.8
CVE-2026-20242: Cisco Secure Firewall Management Center allows remote code execution
CVE-2026-20242 · published 26 days ago
Summary
The Cisco Secure Firewall Management Center can be tricked into running any command as the system administrator if an attacker controls a host that is allowed to access its external database. This could let the attacker take full control of the device. Limit which hosts are on the external database list and keep the management interface off the public internet to mitigate the risk.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| cisco | cisco secure firewall management center (fmc) | 7.0.0 |
Original advisory text
Cisco Secure Firewall Management Center Software Java Deserialization Remote Code Execution Vulnerability
A vulnerability in the External Database Access feature of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to execute arbitrary commands as root on an affected device.
This vulnerability is due to insecure deserialization of a user-supplied Java byte stream from a host that is configured in the external database access list. An attacker could exploit this vulnerability by sending a crafted, serialized Java byte stream to a specific TCP port of an affected device. A successful exploit could allow the attacker to execute arbitrary commands on the device and elevate privileges to root.
Notes:
This vulnerability can be exploited only by an attacker who has control of a host in the external database access list.
If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.
This vulnerability is due to insecure deserialization of a user-supplied Java byte stream from a host that is configured in the external database access list. An attacker could exploit this vulnerability by sending a crafted, serialized Java byte stream to a specific TCP port of an affected device. A successful exploit could allow the attacker to execute arbitrary commands on the device and elevate privileges to root.
Notes:
This vulnerability can be exploited only by an attacker who has control of a host in the external database access list.
If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.
Internet-facing
3 days
Internal
60 days
- Not known to be exploited
- Can be exploited automatically
- Gives an attacker full control
Type
CWE-502Deserialization of Untrusted Data
Timeline
Published16 Sep 2026
Updated11 Oct 2026
First seen16 Sep 2026
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