{"id":"CVE-2025-11933","title":"Improper Input Validation in the TLS 1.3 CKS extension parsing in wolfSSL 5.8.2 and earlier on multiple platforms allows a remote unauthenticated attacker to potentially cause a denial-of-service via a crafted ClientHello message with du…","summary":"Improper Input Validation in the TLS 1.3 CKS extension parsing in wolfSSL 5.8.2 and earlier on multiple platforms allows a remote unauthenticated attacker to potentially cause a denial-of-service via a crafted ClientHello message with du…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-20"],"vendor":"wolfssl","product":"wolfssl","affected":["wolfssl >= 5.8.2, < 5.8.4"],"patched":["wolfssl 5.8.4"],"published":"2025-11-21","updated":"2026-10-08","sourceUpdated":"2026-10-08T10:10:00.227","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-11933","references":[{"url":"https://github.com/wolfSSL/wolfssl","label":"facts@wolfssl.com"},{"url":"https://github.com/wolfSSL/wolfssl/pull/9132","label":"facts@wolfssl.com"}],"tags":["nvd"],"epss":0.00421,"epssPercentile":0.34402,"ingestedAt":"2026-10-08T10:28:20.695Z","slug":"CVE-2025-11933","body":"## Overview\n\nImproper Input Validation in the TLS 1.3 CKS extension parsing in wolfSSL 5.8.2 and earlier on multiple platforms allows a remote unauthenticated attacker to potentially cause a denial-of-service via a crafted ClientHello message with duplicate CKS extensions.\n\n## Affected\n\n- `wolfssl >= 5.8.2, < 5.8.4`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `wolfssl 5.8.4`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}