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CVE-2018-0409

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-08-15 · updated 2026-06-17
• Weakness: CWE-20

Description

A vulnerability in the XCP Router service of the Cisco Unified Communications Manager IM & Presence Service (CUCM IM&P) and the Cisco TelePresence Video Communication Server (VCS) and Expressway could allow an unauthenticated, remote attacker to cause a temporary service outage for all IM&P users, resulting in a denial of service (DoS) condition. The vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending a malicious IPv4 or IPv6 packet to an affected device on TCP port 7400. An exploit could allow the attacker to overread a buffer, resulting in a crash and restart of the XCP Router service. Cisco Bug IDs: CSCvg97663, CSCvi55947.

Affected products

• Cisco TelePresence Video Communication Server (VCS) Expressway: x7.0.1, x7.2.4, x8.1, x8.2.2, x8.5, x8.6 (+5)
• Cisco Unified Communications Manager IM and Presence Service: 11.5, 11.5(1)

References

• http://www.securityfocus.com/bid/105102
• http://www.securityfocus.com/bid/105104
• http://www.securitytracker.com/id/1041533
• http://www.securitytracker.com/id/1041534
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180815-ucmimps-dos
• http://www.securityfocus.com/bid/105102
• http://www.securityfocus.com/bid/105104
• http://www.securitytracker.com/id/1041533
• http://www.securitytracker.com/id/1041534
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180815-ucmimps-dos

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