---
id: "CVE-2026-76481"
kind: "vulnerability"
aliases: ["CVE-2026-76481"]
title: "Cisco Unified Communications: improper exception handling flaws, hardening releases"
severity: "high"
cvss: 7.5
epss: 0.00455
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Cisco Unified Communications Manager", "fixed": ["15SU5"], "affected": "14, 15 < 15SU5", "ecosystem": "vendor"}]
ecosystems: []
tags: ["cisco", "denial-of-service", "infrastructure", "on-premises", "unified-cm", "unified-communications", "unity-connection"]
not_affected_if: []
published_at: "2026-10-21T17:19:07+00:00"
first_seen_at: "2026-10-23T21:57:29+00:00"
updated_at: "2026-10-25T03:20:34+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76481", "first_seen_at": "2026-10-23T21:57:29+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-76481", "first_seen_at": "2026-10-24T13:15:54+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-25T03:20:34+00:00"}]
---

# Cisco Unified Communications: improper exception handling flaws, hardening releases

Cisco Emergency Responder, Unified Communications Manager, Unified CM IM and Presence, Unified CM SME, Prime Collaboration Deployment and Unity Connection ship hardening releases fixing several internally found flaws grouped under CWE-703 (improper handling of exceptional conditions). The sources do not state the specific attacker outcome or the affected versions.

_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

## How to check

Check your version in Cisco Unified CM / IM&P / SME / Unity Connection / Emergency Responder / Prime Collaboration Deployment admin (or CLI 'show version active'). Release 14 or any 15 earlier than 15SU5 is affected, regardless of configuration.

## Fix

Upgrade to release 15SU5 or later. Release 14 has no fixed build; Cisco says migrate to a fixed release (15SU5). No workarounds.

## Timeline

- 2026-10-23T21:57:29+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-76481
- 2026-10-24T13:15:54+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-76481
- 2026-10-25T03:20:34+00:00 analyst — Read Cisco advisory cisco-sa-voice-hardening-twgbH9e3: CVE-2026-76481 is the CWE-703 group (uncaught exceptions/reachable assertions), max CVSS 7.5 (AV:N, PR:N, availability only); sibling CVEs 76473-76479 cover other CWEs. Fixed: 15SU5; release 14 has no fix, migrate. Not exploited per PSIRT, no workarounds. Per-flaw details not published.

## 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

## 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-2026-76481 are related to issues concerning improper handling of exceptional conditions that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-703.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_