{"id":"CVE-2020-11633","aliases":["EUVD-2020-3978","GHSA-4p36-pgfp-hv82"],"status":"published","title":"The Zscaler Client Connector for Windows prior to 2.1.2.74 had a stack based buffer overflow when...","description":"The Zscaler Client Connector for Windows prior to 2.1.2.74 had a stack based buffer overflow when connecting to misconfigured TLS servers. An adversary would potentially have been able to execute arbitrary code with system privileges.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01891,"percentile":0.79743,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2021-07-15T17:01:13Z","modified":"2026-06-17T02:50:31Z","products":[{"vendor":"zscaler","product":"client_connector"}],"references":[{"url":"https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2020?applicable_category=Windows\u0026applicable_version=2.1.2.81","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-11633"},{"url":"https://github.com/advisories/GHSA-4p36-pgfp-hv82"}],"sources":{"cve":[{"id":"CVE-2020-11633","description":"The Zscaler Client Connector for Windows prior to 2.1.2.74 had a stack based buffer overflow when connecting to misconfigured TLS servers. An adversary would potentially have been able to execute arbitrary code with system privileges.","status":"published","published":"2021-07-15T17:01:13Z","modified":"2024-08-04T11:35:13.575Z","updated_at":"2026-11-02T14:35:57.67317Z"}],"euvd":[{"id":"EUVD-2020-3978","description":"The Zscaler Client Connector for Windows prior to 2.1.2.74 had a stack based buffer overflow when connecting to misconfigured TLS servers. An adversary would potentially have been able to execute arbitrary code with system privileges.","status":"published","published":"2021-07-15T17:01:13Z","modified":"2024-08-04T11:35:13Z","updated_at":"2026-11-03T03:07:42.866588Z"}],"ghsa":[{"id":"GHSA-4p36-pgfp-hv82","title":"The Zscaler Client Connector for Windows prior to 2.1.2.74 had a stack based buffer overflow when...","description":"The Zscaler Client Connector for Windows prior to 2.1.2.74 had a stack based buffer overflow when connecting to misconfigured TLS servers. An adversary would potentially have been able to execute arbitrary code with system privileges.","status":"published","published":"2022-05-24T19:08:10Z","modified":"2023-01-30T05:00:50Z","cwes":["CWE-787"],"updated_at":"2026-11-02T14:46:16.829694Z"}],"nvd":[{"id":"CVE-2020-11633","description":"The Zscaler Client Connector for Windows prior to 2.1.2.74 had a stack based buffer overflow when connecting to misconfigured TLS servers. An adversary would potentially have been able to execute arbitrary code with system privileges.","status":"published","published":"2021-07-15T18:15:08.643Z","modified":"2026-06-17T02:50:31.507Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":10,"vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:06:44.292752Z"}]}}