Denial of service in Cisco 6800 Series IP Phones - CVE-2017-6656
Published: June 8, 2017 / Updated: June 9, 2017
Vulnerability identifier: #VU6983
CSH Severity: Low
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-6656
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The weakness exists in the Session Initiation Protocol (SIP) due to incomplete input validation of the SIP packet header. A remote attacker can send a specially crafted malformed SIP packet to the target phone, cause the SIP process to restart and all active phone calls to drop.
Successful exploitation of the vulnerability results in denial of service.
The weakness exists in the Session Initiation Protocol (SIP) due to incomplete input validation of the SIP packet header. A remote attacker can send a specially crafted malformed SIP packet to the target phone, cause the SIP process to restart and all active phone calls to drop.
Successful exploitation of the vulnerability results in denial of service.
Affected software
Cisco 6800 Series IP Phones
How to mitigate CVE-2017-6656
Install update from vendor's website.