CVE-2018-0325

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-05-17 · updated 2026-06-17
Weakness: CWE-20

Description

A vulnerability in the Session Initiation Protocol (SIP) call-handling functionality of Cisco IP Phone 7800 Series phones and Cisco IP Phone 8800 Series phones could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected phone. The vulnerability is due to incomplete input validation of SIP Session Description Protocol (SDP) parameters by the SDP parser of an affected phone. An attacker could exploit this vulnerability by sending a malformed SIP packet to an affected phone. A successful exploit could allow the attacker to cause all active phone calls on the affected phone to be dropped while the SIP process on the phone unexpectedly restarts, resulting in a DoS condition. Cisco Bug IDs: CSCvf40066.

Affected products

Cisco Ip Phone 7800 Firmware: before 12.1\(1.12\); before 12.1\(1\)mn130 — fixed in 12.1\(1.12\), 12.1\(1\)mn130
Cisco Ip Phone 8800 Firmware: 9.4(2)sr4, 10.3(1)sr4

How to fix

Upgrade to a fixed version: Cisco Ip Phone 7800 Firmware 12.1\(1.12\), 12.1\(1\)mn130. Check the vendor advisory for mitigations.

References

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