What’s Vulnerable › Vulnerabilities

CVE-2019-1676: Cisco Meeting Server SIP Processing Denial of Service Vulnerability

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-02-08 · updated 2026-06-17
• Weakness: CWE-20

Description

A vulnerability in the Session Initiation Protocol (SIP) call processing of Cisco Meeting Server (CMS) software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition of the Cisco Meeting Server. The vulnerability is due to insufficient validation of Session Description Protocol (SDP) messages. An attacker could exploit this vulnerability by sending a crafted SDP message to the CMS call bridge. An exploit could allow the attacker to cause the CMS to reload, causing a DoS condition for all connected clients. Versions prior to 2.3.9 are affected.

Affected products

• Cisco Meeting Server: from 2.3.0 before 2.3.9 — fixed in 2.3.9

How to fix

Upgrade to a fixed version: Cisco Meeting Server 2.3.9. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/106909
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190206-meeting-sipdos
• http://www.securityfocus.com/bid/106909
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190206-meeting-sipdos

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