Security restrictions bypass in Cisco Firepower Management Center

Published: 2017-08-03
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-6766
Exploitation vector Network
Public exploit N/A
Vulnerable software
Cisco Firepower Management Center
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor Cisco Systems, Inc

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Security restrictions bypass


Risk: Low

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-6766

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No


The vulnerability allows a remote unauthenticated attacker to bypass security restrictions on the target system.

The weakness exists in the Secure Sockets Layer (SSL) Decryption and Inspection feature of Cisco Firepower System Software due to unexpected interaction with Known Key and Decrypt and Resign configuration settings of SSL policies. A remote attacker can send a specially crafted SSL packet through an affected device in a valid SSL session and bypass the SSL decryption and inspection policy.


The vulnerability is fixed in version

Vulnerable software versions

Cisco Firepower Management Center: 5.4.0 - 6.2.2

External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.