{"id":"CVE-2026-76473","kind":"vulnerability","aliases":["CVE-2026-76473"],"related":[],"title":"Cisco Unified Communications Manager and Unity Connection: critical flaws fixed in 15SU5","description":"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.\r\n\r\nThe 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.\r\n&nbsp;","summary":"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.","severity":"critical","cvss":9.8,"epss":0.00356,"exploited":false,"exploited_at":null,"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"],"how_to_check":null,"fix":"Upgrade affected Cisco Unified CM, Unity Connection, Emergency Responder and Prime Collaboration Deployment installs on 14 or 15 to 15SU5.","status":"resolved","published_at":"2026-10-21T17:19:06+00:00","first_seen_at":"2026-10-23T21:57:29+00:00","triaged_at":"2026-10-23T22:33:11+00:00","updated_at":"2026-10-24T13:15:54+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T22:33:11Z","model":"claude-haiku-5-5","output":{"fix":"Upgrade affected Cisco Unified CM, Unity Connection, Emergency Responder and Prime Collaboration Deployment installs on 14 or 15 to 15SU5.","reach":"unknown","title":"Cisco Unified Communications Manager and Unity Connection: critical flaws fixed in 15SU5","impact":"high","summary":"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.","category":"infrastructure","who_cares":["cisco","unified-cm","unity-connection","emergency-responder","voice","self-hosted"],"confidence":0.6,"needs_auth":"unknown","worst_case":"unknown; sources give only a CVSS 9.8 score","analyst_note":"Check the Cisco security advisory for CVE-2026-76473 for the attack vector, authentication requirement, and how to confirm the installed version is below 15SU5; the NVD entry does not say.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["unknown"],"user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000845,"input_tokens":3296,"output_tokens":1030,"severity_before":"critical"},"analyst_status":"done","analyst_note":"Pull the Cisco security advisory and NVD CVSS vector to confirm affected releases, fixed versions, auth requirement and attack vector.","search":"'-2026':14A,17A,172C '-74':198C '-76473':15A,18A,173C '15su5':12A,69B '9.8':77B 'address':162C 'attack':84B 'cisco':1A,19A,23A,26A,29A,33B,48B,96C,109C,112C,116C,122C,133C,144C 'class':196C 'cm':43B,59B,121C,130C,141C 'collabor':65B,114C 'collaboration':31A 'commit':99C 'common':192C 'communic':3A,118C,124C,135C 'communications':21A 'comprehens':150C 'concern':178C 'conduct':148C 'connect':7A,46B,61B,146C 'connection':25A 'control':180C 'critic':8A 'cve':13A,16A,171C 'cvss':76B 'cwe':195C,197C 'deploy':66B,115C 'deployment':32A 'discov':165C 'edit':139C 'emerg':35B,62B,110C 'emergency':27A 'emergency-respond':34B 'engin':106C 'enumer':194C 'exact':89B 'fix':10A,49B 'flaw':9A,53B 'found':52B 'group':189C 'harden':159C 'host':40B 'im':126C,131C 'impact':90B 'improp':179C 'infrastructur':37B 'intern':51B,151C,164C 'issu':177C 'lifetim':186C 'manag':4A,119C,125C,136C,138C 'manager':22A 'multipl':163C 'ongo':98C 'p':132C 'part':94C 'platform':57B 'presenc':127C 'prime':30A,64B,113C 'proactiv':101C 'product':104C 'qualiti':105C 'relat':175C 'releas':68B,160C 'resourc':183C 'respond':36B,63B,111C 'responder':28A 'result':156C 'review':153C,155C 'say':81B 'score':72B 'secur':102C,152C 'self':39B 'self-host':38B 'servic':128C 'session':137C 'set':74B 'sever':50B 'sme':142C 'softwar':158C 'sourc':71B 'team':107C 'track':169C 'unifi':2A,42B,58B,117C,120C,123C,129C,134C,140C 'unified':20A 'unified-cm':41B 'uniti':6A,45B,60B,145C 'unity':24A 'unity-connect':44B 'unknown':92B 'voic':47B,56B 'vulner':166C,168C 'weak':193C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-21T17:19:06+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"psirt@cisco.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-76473","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76473","severity":null,"published_at":"2026-10-21T17:19:06+00:00","modified_at":"2026-10-22T23:19:07+00:00","first_seen_at":"2026-10-23T21:57:29+00:00","fetched_at":"2026-10-23T22:29:01+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-76473:234","url":null,"severity":null,"published_at":"2026-10-23T22:29:33+00:00","modified_at":"2026-10-23T22:29:33+00:00","first_seen_at":"2026-10-23T22:29:33+00:00","fetched_at":"2026-10-23T22:29:33+00:00","note":"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."},{"source":"epss","external_id":"CVE-2026-76473","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-76473","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T13:15:54+00:00","fetched_at":"2026-10-24T13:15:54+00:00","note":null}],"documents":[{"id":1474,"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voice-hardening-twgbH9e3","title":"Cisco Unified Communications Products Security Hardening Release: October 2026","kind":"advisory","source":"analyst","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":null},{"id":1475,"url":"https://www.securityweek.com/cisco-patches-34-vulnerabilities-across-multiple-products/","title":"Cisco Patches 34 Vulnerabilities Across Multiple Products - SecurityWeek","kind":"blog","source":"analyst","text":null,"published_at":null,"relation":"mentions","confidence":null,"note":null}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}