# MA-895.122022: MyCERT Advisory - Cisco Releases Security Advisory for IP Phone 7800 and 8800 Series

**Date:** 12 Dec 2022  
**Source:** https://www.mycert.org.my/portal/advisory?id=MA-895.122022  
**Advisory ID:** MA-895.122022

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**1.0 Introduction**
Recently, Cisco released a security advisory for a vulnerability affecting IP Phone 7800 and 8800 Series.
**2.0 Impact**
A remote attacker could exploit this vulnerability to cause a denial-of-service condition. A vulnerability in the Cisco Discovery Protocol processing feature of Cisco IP Phone 7800 and 8800 Series firmware could allow an unauthenticated, adjacent attacker to cause a stack overflow on an affected device.
This vulnerability is due to insufficient input validation of received Cisco Discovery Protocol packets. An attacker could exploit this vulnerability by sending crafted Cisco Discovery Protocol traffic to an affected device. A successful exploit could allow the attacker to cause a stack overflow, resulting in possible remote code execution or a denial of service (DoS) condition on an affected device.
**3.0 Affected Products**
- IP Phone 8800 Series (except Cisco Wireless IP Phone 8821)
- IP Phone 7800 Series
**4.0 Recommendations**
MyCERT encourages users and administrators to review [Cisco IP Phone 7800 and 8800 Series Cisco Discovery Protocol Stack Overflow Vulnerability](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipp-oobwrite-8cMF5r7U) and apply the necessary updates.
Generally, MyCERT advises the users of this devices to be updated with the latest security announcements by the vendor and follow best practice security policies to determine which updates should be applied.
For further enquiries, please contact MyCERT through the following channels:
E-mail: cyber999[at]cybersecurity.my 
Phone: 1-300-88-2999 (monitored during business hours) 
Mobile: +60 19 2665850 (24x7 call incident reporting) 
Business Hours: Mon - Fri 09:00 -18:00 MYT 
Web: <https://www.mycert.org.my> 
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Facebook: <https://www.facebook.com/mycert.org.my>
**5.0    References**
- <https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipp-oobwrite-8cMF5r7U>
- <https://www.cisa.gov/uscert/ncas/current-activity/2022/12/09/cisco-releases-security-advisory-ip-phone-7800-and-8800-series>