CVE-2019-1635

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

2.0% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-05-03 15:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:28 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.0% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-05-03 15:29 UTC

Last modified

2026-06-17 02:28 UTC

Exploit probability

2.0% · EPSS, next 30 days

Weakness

CWE-399

Record status

Modified

Affected

• Cisco Ip Conference Phone 7832 Firmware 9.3\(4\)sr3
• Cisco Ip Conference Phone 7832 Firmware 10.3\(1\)sr4b
• Cisco Ip Conference Phone 7832 Firmware 11.0\(4\)sr2
• Cisco Ip Conference Phone 7832 Firmware 12.1\(1\)sr1
• Cisco Ip Conference Phone 8832 Firmware 9.3\(4\)sr3
• Cisco Ip Conference Phone 8832 Firmware 10.3\(1\)sr4b
• Cisco Ip Conference Phone 8832 Firmware 11.0\(4\)sr2
• Cisco Ip Conference Phone 8832 Firmware 12.1\(1\)sr1

Attack profile CVSS 3.1 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-1635.md and follow it. Check whether this project is affected by CVE-2019-1635. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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