Input validation error in Cisco Firewall Threat Defense (FTD) - CVE-2019-1691
Published: February 22, 2019
Vulnerability identifier: #VU17844
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-1691
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco Firewall Threat Defense (FTD)
Cisco Firewall Threat Defense (FTD)
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists in the detection engine due to the incomplete error handling of the SSL or TLS packet header during the connection establishment. A remote attacker can send a specially crafted SSL or TLS packet during the connection handshake and cause the SNORT detection engine to unexpectedly restart, resulting in a partial DoS condition while the detection engine restarts.
How to mitigate CVE-2019-1691
Install updates from vendor's website.