Deep SSL/TLS Vulnerability Test
This report provides a deep analysis of the SSL/TLS configuration of challenges.cloudflare.com. It checks for protocol support, cipher strength, and known vulnerabilities.
Scan Results
Testing all IP addresses (port 443): 104.18.94.41 104.18.95.41 ----------------------------------------------------- Start 2026-09-11 07:48:52 -->> 104.18.94.41:443 (challenges.cloudflare.com) <<-- Further IP addresses: 104.18.95.41 2606:4700::6812:5e29 2606:4700::6812:5f29 rDNS (104.18.94.41): -- Service detected: HTTP Testing for server implementation bugs No bugs found. Testing HTTP header response @ "/" HTTP Status Code 200 OK HTTP clock skew 0 sec from localtime Strict Transport Security not offered Public Key Pinning -- Server banner cloudflare Application banner -- Cookie(s) (none issued at "/") Security headers X-Frame-Options: DENY X-Content-Type-Options: nosniff Content-Security-Policy: default-src 'self'; script-src 'none'; style-src 'self'; img-src 'self'; frame-src 'none'; manifest-src 'none'; object-src 'none'; worker-src 'none'; frame-ancestors 'none'; form-action 'none'; block-all-mixed-content; base-uri 'self'; Permissions-Policy: accelerometer=(), ambient-light-sensor=(), autoplay=(), camera=(), encrypted-media=(), geolocation=(), fullscreen=(), gyroscope=(), interest-cohort=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), screen-wake-lock=(), sync-xhr=(), usb=(), web-share=() Cross-Origin-Opener-Policy: same-origin Cross-Origin-Resource-Policy: same-origin Cross-Origin-Embedder-Policy: require-corp X-XSS-Protection: 1; mode=block Permissions-Policy: accelerometer=(), ambient-light-sensor=(), autoplay=(), camera=(), encrypted-media=(), geolocation=(), fullscreen=(), gyroscope=(), interest-cohort=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), screen-wake-lock=(), sync-xhr=(), usb=(), web-share=() Referrer-Policy: no-referrer Cache-Control: public, max-age=0, must-revalidate Reverse Proxy banner -- Testing vulnerabilities Secure Renegotiation (RFC 5746) supported (OK) Secure Client-Initiated Renegotiation not vulnerable (OK) CRIME, TLS (CVE-2012-4929) not vulnerable (OK) BREACH (CVE-2013-3587) potentially NOT ok, "br gzip" HTTP compression detected. - only supplied "/" tested Can be ignored for static pages or if no secrets in the page POODLE, SSL (CVE-2014-3566) not vulnerable (OK) TLS_FALLBACK_SCSV (RFC 7507) No fallback possible (OK), no protocol below TLS 1.2 offered SWEET32 (CVE-2016-2183, CVE-2016-6329) not vulnerable (OK) FREAK (CVE-2015-0204) not vulnerable (OK) DROWN (CVE-2016-0800, CVE-2016-0703) not vulnerable on this host and port (OK) make sure you don't use this certificate elsewhere with SSLv2 enabled services, see https://search.censys.io/search?resource=hosts&virtual_hosts=INCLUDE&q=A6C3587582A31DE9C9B567EC63C45CDEEF35FA34F431B98EB16A4946C4D53408 LOGJAM (CVE-2015-4000), experimental not vulnerable (OK): no DH EXPORT ciphers, no DH key detected with <= TLS 1.2 BEAST (CVE-2011-3389) not vulnerable (OK), no SSL3 or TLS1 LUCKY13 (CVE-2013-0169), experimental potentially VULNERABLE, uses obsolete cipher block chaining ciphers with TLS, see server prefs. Winshock (CVE-2014-6321), experimental not vulnerable (OK) RC4 (CVE-2013-2566, CVE-2015-2808) no RC4 ciphers detected (OK) Done 2026-09-11 07:49:43 [ 60s] -->> 104.18.94.41:443 (challenges.cloudflare.com) <<-- ----------------------------------------------------- Start 2026-09-11 07:49:43 -->> 104.18.95.41:443 (challenges.cloudflare.com) <<-- Further IP addresses: 104.18.94.41 2606:4700::6812:5e29 2606:4700::6812:5f29 rDNS (104.18.95.41): -- Service detected: HTTP Testing for server implementation bugs No bugs found. Testing HTTP header response @ "/" HTTP Status Code 200 OK HTTP clock skew 0 sec from localtime Strict Transport Security not offered Public Key Pinning -- Server banner cloudflare Application banner -- Cookie(s) (none issued at "/") Security headers X-Frame-Options: DENY X-Content-Type-Options: nosniff Content-Security-Policy: default-src 'self'; script-src 'none'; style-src 'self'; img-src 'self'; frame-src 'none'; manifest-src 'none'; object-src 'none'; worker-src 'none'; frame-ancestors 'none'; form-action 'none'; block-all-mixed-content; base-uri 'self'; Permissions-Policy: accelerometer=(), ambient-light-sensor=(), autoplay=(), camera=(), encrypted-media=(), geolocation=(), fullscreen=(), gyroscope=(), interest-cohort=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), screen-wake-lock=(), sync-xhr=(), usb=(), web-share=() Cross-Origin-Opener-Policy: same-origin Cross-Origin-Resource-Policy: same-origin Cross-Origin-Embedder-Policy: require-corp X-XSS-Protection: 1; mode=block Permissions-Policy: accelerometer=(), ambient-light-sensor=(), autoplay=(), camera=(), encrypted-media=(), geolocation=(), fullscreen=(), gyroscope=(), interest-cohort=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), screen-wake-lock=(), sync-xhr=(), usb=(), web-share=() Referrer-Policy: no-referrer Cache-Control: public, max-age=0, must-revalidate Reverse Proxy banner -- Testing vulnerabilities Secure Renegotiation (RFC 5746) supported (OK) Secure Client-Initiated Renegotiation not vulnerable (OK) CRIME, TLS (CVE-2012-4929) not vulnerable (OK) BREACH (CVE-2013-3587) potentially NOT ok, "br gzip" HTTP compression detected. - only supplied "/" tested Can be ignored for static pages or if no secrets in the page POODLE, SSL (CVE-2014-3566) not vulnerable (OK) TLS_FALLBACK_SCSV (RFC 7507) No fallback possible (OK), no protocol below TLS 1.2 offered SWEET32 (CVE-2016-2183, CVE-2016-6329) not vulnerable (OK) FREAK (CVE-2015-0204) not vulnerable (OK) DROWN (CVE-2016-0800, CVE-2016-0703) not vulnerable on this host and port (OK) make sure you don't use this certificate elsewhere with SSLv2 enabled services, see https://search.censys.io/search?resource=hosts&virtual_hosts=INCLUDE&q=A6C3587582A31DE9C9B567EC63C45CDEEF35FA34F431B98EB16A4946C4D53408 LOGJAM (CVE-2015-4000), experimental not vulnerable (OK): no DH EXPORT ciphers, no DH key detected with <= TLS 1.2 BEAST (CVE-2011-3389) not vulnerable (OK), no SSL3 or TLS1 LUCKY13 (CVE-2013-0169), experimental potentially VULNERABLE, uses obsolete cipher block chaining ciphers with TLS, see server prefs. Winshock (CVE-2014-6321), experimental not vulnerable (OK) RC4 (CVE-2013-2566, CVE-2015-2808) no RC4 ciphers detected (OK) Done 2026-09-11 07:50:35 [ 112s] -->> 104.18.95.41:443 (challenges.cloudflare.com) <<-- ----------------------------------------------------- Done testing now all IP addresses (on port 443): 104.18.94.41 104.18.95.41
About this Scan
This scan uses testssl.sh to check for:
- Protocols: SSLv2, SSLv3, TLS 1.0, TLS 1.1, TLS 1.2, TLS 1.3
- Vulnerabilities: Heartbleed, POODLE, FREAK, Logjam, DROWN, etc.
- Cipher Suites: Weak ciphers, perfect forward secrecy (PFS) support.