{"id":"CVE-2026-76481","kind":"vulnerability","aliases":["CVE-2026-76481"],"related":[],"title":"Cisco Unified Communications: improper exception handling flaws, hardening releases","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-2026-76481 are related to issues concerning improper handling of exceptional conditions that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-703.","summary":"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.","severity":"high","cvss":7.5,"epss":0.00455,"exploited":false,"exploited_at":null,"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":[],"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.","status":"open","published_at":"2026-10-21T17:19:07+00:00","first_seen_at":"2026-10-23T21:57:29+00:00","triaged_at":"2026-10-25T03:16:33+00:00","updated_at":"2026-10-25T03:20:34+00:00","category":"infrastructure","confidence":0.8,"triage":{"at":"2026-10-25T03:16:33Z","model":"claude-haiku-5-5","output":{"fix":"- Move Cisco Unified Communications products to the fixed release named in Cisco's advisory (version unknown from these sources)","reach":"unknown","title":"Cisco Unified Communications: improper exception handling flaws, hardening releases","impact":"medium","summary":"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.","category":"infrastructure","nicknames":[],"who_cares":["cisco","unified-communications","on-premises"],"confidence":0.3,"needs_auth":"unknown","worst_case":"unknown; sources only say CWE-703 exception handling flaws","analyst_note":"Pull Cisco's security advisory for CVE-2026-76481 to get affected versions, fixed releases, and the specific impact and attack vector.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Organizations running the listed Cisco Unified Communications products on-premises. The sources do not say which versions or configurations are affected, or whether any specific feature must be enabled.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000603,"input_tokens":3534,"output_tokens":500,"severity_before":"high"},"analyst_status":"done","analyst_note":"Pull Cisco's security advisory for CVE-2026-76481 to get affected versions, fixed releases, and the specific impact and attack vector.","search":"'-2026':11A,14A,167C '-703':69B,190C '-76481':12A,15A,168C 'address':157C 'affect':86B 'attack':82B 'cisco':1A,16A,20B,38B,91C,104C,107C,111C,117C,128C,139C 'cm':31B,45B,50B,116C,125C,136C 'collabor':53B,109C 'commit':94C 'common':184C 'communic':3A,34B,42B,113C,119C,130C 'communications':18A 'comprehens':145C 'concern':173C 'condit':74B,178C 'conduct':143C 'connect':37B,57B,141C 'cve':10A,13A,166C 'cwe':68B,187C,189C 'denial':22B 'denial-of-servic':21B 'deploy':54B,110C 'discov':160C 'edit':134C 'emerg':39B,105C 'engin':101C 'enumer':186C 'except':5A,73B,177C 'fix':61B 'flaw':7A,65B 'found':64B 'group':66B,181C 'handl':6A,71B,175C 'harden':8A,59B,154C 'im':46B,121C,126C 'improp':4A,70B,174C 'infrastructur':25B 'intern':63B,146C,159C 'issu':172C 'manag':43B,114C,120C,131C,133C 'manager':19A 'multipl':158C 'on-premis':26B 'ongo':93C 'outcom':83B 'p':127C 'part':89C 'pillar':188C 'premis':28B 'presenc':48B,122C 'prime':52B,108C 'proactiv':96C 'product':99C 'qualiti':100C 'relat':170C 'releas':9A,60B,155C 'respond':40B,106C 'result':151C 'review':148C,150C 'secur':97C,147C 'servic':24B,123C 'session':132C 'sever':62B 'ship':58B 'sme':51B,137C 'softwar':153C 'sourc':76B 'specif':81B 'state':79B 'team':102C 'track':164C 'unifi':2A,30B,33B,41B,44B,49B,112C,115C,118C,124C,129C,135C 'unified':17A 'unified-cm':29B 'unified-commun':32B 'uniti':36B,56B,140C 'unity-connect':35B 'version':87B 'vulner':161C,163C 'weak':185C","nicknames":[],"mitigations":[],"who_affected":"Any team running on-premises Cisco Emergency Responder, Prime Collaboration Deployment, Unified CM, Unified CM IM&P, Unified CM SME or Unity Connection on release 14 or on 15 before 15SU5 is affected, whatever the configuration. Cisco rates the worst flaw in this group as network-reachable, unauthenticated denial of service (CVSS 7.5). Cisco-hosted or non-Cisco voice stacks can skip it.","tier":"B","verified":{"fix":{"at":"2026-10-25T03:20:34Z","by":"analyst","run_id":700},"workarounds":{"at":"2026-10-25T03:20:34Z","by":"analyst","run_id":700},"who_affected":{"at":"2026-10-25T03:20:34Z","by":"analyst","run_id":700}},"analyst_revisit_at":null,"first_public_at":"2026-10-21T17:19:07+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_by":"psirt@cisco.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-76481","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76481","severity":null,"published_at":"2026-10-21T17:19:07+00:00","modified_at":"2026-10-21T18:54:37+00:00","first_seen_at":"2026-10-23T21:57:29+00:00","fetched_at":"2026-10-23T22:29:01+00:00","note":null},{"source":"epss","external_id":"CVE-2026-76481","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-76481","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},{"source":"analyst","external_id":"CVE-2026-76481:700","url":null,"severity":null,"published_at":"2026-10-25T03:20:34+00:00","modified_at":"2026-10-25T03:20:34+00:00","first_seen_at":"2026-10-25T03:20:34+00:00","fetched_at":"2026-10-25T03:20:34+00:00","note":"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":[{"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}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}