Read the docs
TI-2019-01347 Aliases CVE-2019-1721GHSA-7qgm-86vq-4g8p

Cisco Expressway Series and Cisco TelePresence Video Communication Server Denial of Service Vulnerability

Priority LOW 33CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

A vulnerability in the phone book feature of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow an authenticated, remote attacker to cause the CPU to increase to 100% utilization, causing a denial of service (DoS) condition on an affected system. The vulnerability is due to improper handling of the XML input. An attacker could exploit this vulnerability by sending a Session Initiation Protocol (SIP) message with a crafted XML payload to an affected device. A successful exploit could allow the attacker to exhaust CPU resources, resulting in a DoS condition. Manual intervention may be required to recover the device. This vulnerability is fixed in Cisco Expressway Series and Cisco TelePresence Video Communication Server Releases X12.5.1 and later.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02028 81st percentileScored 2026-11-07
Fix Fixed Cisco TelePresence Video Communication Server (VCS) (Cisco): X12.5.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco TelePresence Video Communication Server (VCS)before X12.5.1X12.5.1Patch availableCNA
  • Cisco TelePresence Video Communication Server (VCS) VendorCisco Affected before X12.5.1 Fixed in X12.5.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:cisco:telepresence_video_communication_server:*:*:*:*:*:*:*:*before x12.5.1VulnerableCisco
  • cpe:2.3:a:cisco:telepresence_video_communication_server:*:*:*:*:*:*:*:* Versions before x12.5.1 Vulnerable ·Cisco

Remediation

  • Fix · CNA Cisco TelePresence Video Communication Server (VCS) (Cisco) Fixed in X12.5.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Cisco TelePresence Video Communication Server (VCS) X12.5.1

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2019-01346 Cisco Expressway Series and Cisco TelePresence Video Communication Server Denial of Service VulnerabilityPriority LOW 33
    • TI-2019-01348 Cisco Expressway Series and Cisco TelePresence Video Communication Server Cross-Site Request Forgery VulnerabilityPriority LOW 30
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-1721
  2. 2026-10-03 Alias added: GHSA-7qgm-86vq-4g8p

References

Advisory 1

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2023-06915 Code injection in Cisco TelePresence Video Communication Server Expressway CVSS 3.1HIGH 7.2
  • TI-2019-01468 Improper input validation in Cisco TelePresence Video Communication Server CVSS 3.0HIGH 8.6
  • TI-2022-05314 Cisco Expressway Series and Cisco TelePresence Video Communication Server Vulnerabilities CVSS 3.1CRITICAL 9.0
  • TI-2022-05313 Cisco Expressway Series and Cisco TelePresence Video Communication Server Vulnerabilities CVSS 3.1CRITICAL 9.0
  • TI-2022-05371 Cisco Expressway Series and Cisco TelePresence Video Communication Server Vulnerabilities CVSS 3.1CRITICAL 9.0
See all 41 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences