CVE-2019-1635 Cisco IP Phone 7800 Series and 8800 Series Session Initiation Protocol XML Denial of Service Vulnerability
Remote attackers can cause Cisco IP phones to reload unexpectedly by sending malicious SIP packets with crafted XML payloads.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-1635?
CVE-2019-1635 is a high-severity denial of service vulnerability in Cisco IP Phone 7800 Series and 8800 Series, published on 3 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the call-handling functionality of Session Initiation Protocol (SIP) Software for Cisco IP Phone 7800 Series and 8800 Series could allow an unauthenticated, remote attacker to cause an affected phone to reload unexpectedly, resulting in a temporary denial of service (DoS) condition. The vulnerability is due to incomplete error handling when XML data within a SIP packet is parsed. An attacker could exploit this vulnerability by sending a SIP packet that contains a malicious XML payload to an affected phone. A successful exploit could allow the attacker to cause the affected phone to reload unexpectedly, resulting in a temporary DoS condition.
Which versions are affected by CVE-2019-1635?
It affects 16 products.
Products include Cisco Ip Conference Phone 7832 Firmware, Cisco Ip Conference Phone 8832 Firmware, Cisco Ip Phone 7811 Firmware, Cisco Ip Phone 7821 Firmware, Cisco Ip Phone 7841 Firmware, Cisco Ip Phone 7861 Firmware and 10 more.
How do I fix CVE-2019-1635?
No fix has been published for CVE-2019-1635 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2019-1635 being exploited?
There is no known exploitation of CVE-2019-1635 in the wild and no public exploit code.
Other vulnerabilities in Cisco IP Phone 7800 Series and 8800 Series
- CVE-2020-3111 Cisco IP Phone Remote Code Execution and Denial of Service Vulnerability
- CVE-2021-1379 Memory corruption in Cisco IP Phones with Multiplatform Firmware
- CVE-2019-1684 Denial of service in Cisco IP Phone 8800 Series Software
- CVE-2021-34711 Cisco IP Phone Software Arbitrary File Read Vulnerability
- CVE-2019-1922 Cisco IP Phone 7800 and 8800 Series Session Initiation Protocol Denial of Service Vulnerability
Sources
Also known as GHSA-mc83-gm47-m9vc.