---
id: "CVE-2026-76473"
kind: "vulnerability"
aliases: ["CVE-2026-76473"]
title: "Cisco Unified Communications Manager and Unity Connection: critical flaws fixed in 15SU5"
severity: "critical"
cvss: 9.8
epss: 0.00356
exploited: false
status: "resolved"
category: "infrastructure"
products: [{"name": "Cisco Unified Communications Manager", "fixed": ["15SU5"], "affected": "14, 15 < 15SU5", "ecosystem": "vendor"}, {"name": "Cisco Unity Connection", "fixed": ["15SU5"], "affected": "14, 15 < 15SU5", "ecosystem": "vendor"}, {"name": "Cisco Emergency Responder", "fixed": ["15SU5"], "affected": "14, 15 < 15SU5", "ecosystem": "vendor"}, {"name": "Cisco Prime Collaboration Deployment", "fixed": ["15SU5"], "affected": "14, 15 < 15SU5", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["cisco", "emergency-responder", "infrastructure", "self-hosted", "unified-cm", "unity-connection", "voice"]
not_affected_if: ["unknown"]
published_at: "2026-10-21T17:19:06+00:00"
first_seen_at: "2026-10-23T21:57:29+00:00"
updated_at: "2026-10-24T13:15:54+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76473", "first_seen_at": "2026-10-23T21:57:29+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-23T22:29:33+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-76473", "first_seen_at": "2026-10-24T13:15:54+00:00"}]
---

# Cisco Unified Communications Manager and Unity Connection: critical flaws fixed in 15SU5

Cisco fixed several internally found flaws in its voice platforms (Unified CM, Unity Connection, Emergency Responder, Prime Collaboration Deployment) in release 15SU5. The sources score the set at CVSS 9.8 but do not say what an attacker can do, so the exact impact is unknown.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Cisco Unified Communications Manager affected 14, 15 < 15SU5 fixed 15SU5
- vendor:Cisco Unity Connection affected 14, 15 < 15SU5 fixed 15SU5
- vendor:Cisco Emergency Responder affected 14, 15 < 15SU5 fixed 15SU5
- vendor:Cisco Prime Collaboration Deployment affected 14, 15 < 15SU5 fixed 15SU5

## Fix

Upgrade affected Cisco Unified CM, Unity Connection, Emergency Responder and Prime Collaboration Deployment installs on 14 or 15 to 15SU5.

## Timeline

- 2026-10-23T21:57:29+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-76473
- 2026-10-23T22:29:33+00:00 analyst — Read Cisco advisory cisco-sa-voice-hardening-twgbH9e3: one CVE per CWE group, 9.8 is max of the worst hidden bug; no per-bug detail, not exploited per PSIRT, no workaround. Sibling CVEs 76474-76481 share the advisory.
- 2026-10-24T13:15:54+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-76473

## Documents

- [advisory] Cisco Unified Communications Products Security Hardening Release: October 2026 https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voice-hardening-twgbH9e3
- [mentions] Cisco Patches 34 Vulnerabilities Across Multiple Products - SecurityWeek https://www.securityweek.com/cisco-patches-34-vulnerabilities-across-multiple-products/

## From the sources

As part of Cisco's ongoing commitment to proactive security and product quality, engineering teams for Cisco Emergency Responder, Cisco Prime Collaboration Deployment, Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager IM &amp; Presence Service (Unified CM IM&amp;P), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), and Cisco Unity Connection have conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.

The vulnerabilities tracked by CVE-2026-76473 are related to issues concerning improper control of a resource through its lifetime that are grouped under the Common Weakness Enumeration (CWE) Class CWE-74.
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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_