{"id":"CVE-2026-62757","title":"Windows Schannel Security Feature Bypass Vulnerability","summary":"Improper verification of cryptographic signature in Windows Schannel allows an unauthorized attacker to bypass a security feature over a network.","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C","cvssSource":"cna","cwe":["CWE-347"],"vendor":"Microsoft","product":"Windows 10 Version 1607","affected":["windows_10_version_1607 >= 10.0.14393.0 < 10.0.14393.9418","windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.9121","windows_10_version_21h2 >= 10.0.19044.0 < 10.0.19044.7663","windows_10_version_22h2 >= 10.0.19045.0 < 10.0.19045.7663","windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7517","windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7517","windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.9168","windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.9168","windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2704","windows_server_2012 >= 6.2.9200.0 < 6.2.9200.26280","windows_server_2012_server_core_installation >= 6.2.9200.0 < 6.2.9200.26280","windows_server_2012_r2 >= 6.3.9600.0 < 6.3.9600.23338","windows_server_2012_r2_server_core_installation >= 6.3.9600.0 < 6.3.9600.23338","windows_server_2016 >= 10.0.14393.0 < 10.0.14393.9418","windows_server_2016_server_core_installation >= 10.0.14393.0 < 10.0.14393.9418","windows_server_2019 >= 10.0.17763.0 < 10.0.17763.9121","windows_server_2019_server_core_installation >= 10.0.17763.0 < 10.0.17763.9121","windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5499","windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33296","windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.33296"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-08-12T03:56:19.900948Z"},"published":"2026-08-11","updated":"2026-09-16","sourceUpdated":"2026-09-16T16:25:38.412Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-62757","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62757","label":"Windows Schannel Security Feature Bypass Vulnerability"}],"tags":["cve.org"],"epss":0.00255,"epssPercentile":0.17353,"ingestedAt":"2026-09-08T18:07:34.891Z","slug":"CVE-2026-62757","body":"## Overview\n\nImproper verification of cryptographic signature in Windows Schannel allows an unauthorized attacker to bypass a security feature over a network.\n\n## Affected\n\n- `windows_10_version_1607 >= 10.0.14393.0 < 10.0.14393.9418`\n- `windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.9121`\n- `windows_10_version_21h2 >= 10.0.19044.0 < 10.0.19044.7663`\n- `windows_10_version_22h2 >= 10.0.19045.0 < 10.0.19045.7663`\n- `windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7517`\n- `windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7517`\n- `windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.9168`\n- `windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.9168`\n- `windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2704`\n- `windows_server_2012 >= 6.2.9200.0 < 6.2.9200.26280`\n- `windows_server_2012_server_core_installation >= 6.2.9200.0 < 6.2.9200.26280`\n- `windows_server_2012_r2 >= 6.3.9600.0 < 6.3.9600.23338`\n- `windows_server_2012_r2_server_core_installation >= 6.3.9600.0 < 6.3.9600.23338`\n- `windows_server_2016 >= 10.0.14393.0 < 10.0.14393.9418`\n- `windows_server_2016_server_core_installation >= 10.0.14393.0 < 10.0.14393.9418`\n- `windows_server_2019 >= 10.0.17763.0 < 10.0.17763.9121`\n- `windows_server_2019_server_core_installation >= 10.0.17763.0 < 10.0.17763.9121`\n- `windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5499`\n- `windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33296`\n- `windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.33296`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}