{"api_version":"1","generated_at":"2026-10-01T12:49:26+00:00","cve":"CVE-2026-25687","urls":{"html":"https://cve.report/CVE-2026-25687","api":"https://cve.report/api/cve/CVE-2026-25687.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-25687","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-25687"},"summary":{"title":"ZCC race condition in ZPA tunnel handler","description":"A race condition in the ZPA tunnel handler of affected versions of Zscaler Client Connector (ZCC) allows a heap corruption, resulting in a denial of service (client crash) and potentially arbitrary code execution in the context of the ZCC process.","state":"PUBLISHED","assigner":"Zscaler","published_at":"2026-09-14 15:17:05","updated_at":"2026-09-18 19:08:02"},"problem_types":["CWE-366","CWE-366 CWE-366 Race condition within a thread"],"metrics":[{"version":"3.1","source":"cve@zscaler.com","type":"Secondary","score":"8.1","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"8.1","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2026","name":"https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2026","refsource":"cve@zscaler.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-25687","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25687","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Zscaler","product":"Client Connector","version":"affected 4.6 4.6.0.486 custom","platforms":["Windows"]},{"source":"CNA","vendor":"Zscaler","product":"Client Connector","version":"affected 4.7 4.7.0.350 custom","platforms":["Windows"]},{"source":"CNA","vendor":"Zscaler","product":"Client Connector","version":"affected 4.8 4.8.0.267 custom","platforms":["Windows"]},{"source":"CNA","vendor":"Zscaler","product":"Client Connector","version":"affected 4.9 4.9.0.412 custom","platforms":["Windows"]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"GovTech Singapore Red Team","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"25687","cve":"CVE-2026-25687","epss":"0.002310000","percentile":"0.142490000","score_date":"2026-09-21","updated_at":"2026-09-22 00:03:18"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-25687","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-09-14T00:00:00+00:00","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-09-15T03:56:03.896Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","platforms":["Windows"],"product":"Client Connector","vendor":"Zscaler","versions":[{"lessThan":"4.6.0.486","status":"affected","version":"4.6","versionType":"custom"},{"lessThan":"4.7.0.350","status":"affected","version":"4.7","versionType":"custom"},{"lessThan":"4.8.0.267","status":"affected","version":"4.8","versionType":"custom"},{"lessThan":"4.9.0.412","status":"affected","version":"4.9","versionType":"custom"}]}],"credits":[{"lang":"en","type":"finder","value":"GovTech Singapore Red Team"}],"datePublic":"2026-09-14T14:36:00.000Z","descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"A race condition in the ZPA tunnel handler of affected versions of Zscaler Client Connector (ZCC) allows a heap corruption, resulting in a denial of service (client crash) and potentially arbitrary code execution in the context of the ZCC process."}],"value":"A race condition in the ZPA tunnel handler of affected versions of Zscaler Client Connector (ZCC) allows a heap corruption, resulting in a denial of service (client crash) and potentially arbitrary code execution in the context of the ZCC process."}],"impacts":[{"capecId":"CAPEC-549","descriptions":[{"lang":"en","value":"CAPEC-549 Local Execution of Code"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-366","description":"CWE-366 Race condition within a thread","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-09-14T14:37:04.331Z","orgId":"73c6f63b-efac-410d-a0a9-569700f85a04","shortName":"Zscaler"},"references":[{"url":"https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2026"}],"source":{"discovery":"UNKNOWN"},"title":"ZCC race condition in ZPA tunnel handler","x_generator":{"engine":"Vulnogram 1.0.4"}}},"cveMetadata":{"assignerOrgId":"73c6f63b-efac-410d-a0a9-569700f85a04","assignerShortName":"Zscaler","cveId":"CVE-2026-25687","datePublished":"2026-09-14T14:37:04.331Z","dateReserved":"2026-02-05T05:00:40.582Z","dateUpdated":"2026-09-15T03:56:03.896Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-14 15:17:05","lastModifiedDate":"2026-09-18 19:08:02","problem_types":["CWE-366","CWE-366 CWE-366 Race condition within a thread"],"metrics":{"cvssMetricV31":[{"source":"cve@zscaler.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.2,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-14T00:00:00+00:00","id":"CVE-2026-25687","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"25687","Ordinal":"1","Title":"ZCC race condition in ZPA tunnel handler","CVE":"CVE-2026-25687","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"25687","Ordinal":"1","NoteData":"A race condition in the ZPA tunnel handler of affected versions of Zscaler Client Connector (ZCC) allows a heap corruption, resulting in a denial of service (client crash) and potentially arbitrary code execution in the context of the ZCC process.","Type":"Description","Title":"ZCC race condition in ZPA tunnel handler"}]}}}