Deep SSL/TLS Vulnerability Test
This report provides a deep analysis of the SSL/TLS configuration of cdn.tailwindcss.com. It checks for protocol support, cipher strength, and known vulnerabilities.
Scan Results
Testing all IP addresses (port 443): 104.26.3.143 104.26.2.143 172.67.68.11 ----------------------------------------------------- Start 2026-10-09 21:10:21 -->> 104.26.3.143:443 (cdn.tailwindcss.com) <<-- Further IP addresses: 172.67.68.11 104.26.2.143 2606:4700:20::681a:28f 2606:4700:20::681a:38f 2606:4700:20::ac43:440b rDNS (104.26.3.143): -- Service detected: HTTP Testing for server implementation bugs No bugs found. Testing HTTP header response @ "/" HTTP Status Code 302 Found, redirecting to "" HTTP clock skew +296 sec from localtime HTTP Age (RFC 7234) 296 Strict Transport Security 730 days=63072000 s, just this domain Public Key Pinning -- Server banner cloudflare Application banner -- Cookie(s) (none issued at "/") -- maybe better try target URL of 30x Security headers Cache-Control: max-age=14400 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) no gzip/deflate/compress/br HTTP compression (OK) - only supplied "/" tested POODLE, SSL (CVE-2014-3566) not vulnerable (OK) TLS_FALLBACK_SCSV (RFC 7507) Downgrade attack prevention supported (OK) SWEET32 (CVE-2016-2183, CVE-2016-6329) VULNERABLE, uses 64 bit block ciphers 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=2C2A0BDD33A869054C1FEF23E6CF1ABFC5BDFE0B7326CB1F1B9212D32E4CF9EE LOGJAM (CVE-2015-4000), experimental not vulnerable (OK): no DH EXPORT ciphers, no DH key detected with <= TLS 1.2 BEAST (CVE-2011-3389) TLS1: ECDHE-RSA-AES128-SHA AES128-SHA ECDHE-RSA-AES256-SHA AES256-SHA DES-CBC3-SHA VULNERABLE -- but also supports higher protocols TLSv1.1 TLSv1.2 (likely mitigated) 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 2026-10-09 21:11:19 [ 69s] -->> 104.26.3.143:443 (cdn.tailwindcss.com) <<-- ----------------------------------------------------- Start 2026-10-09 21:11:19 -->> 104.26.2.143:443 (cdn.tailwindcss.com) <<-- Further IP addresses: 172.67.68.11 104.26.3.143 2606:4700:20::681a:28f 2606:4700:20::681a:38f 2606:4700:20::ac43:440b rDNS (104.26.2.143): -- Service detected: HTTP Testing for server implementation bugs No bugs found. Testing HTTP header response @ "/" HTTP Status Code 302 Found, redirecting to "" HTTP clock skew +359 sec from localtime HTTP Age (RFC 7234) 359 Strict Transport Security 730 days=63072000 s, just this domain Public Key Pinning -- Server banner cloudflare Application banner -- Cookie(s) (none issued at "/") -- maybe better try target URL of 30x Security headers Cache-Control: max-age=14400 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) no gzip/deflate/compress/br HTTP compression (OK) - only supplied "/" tested POODLE, SSL (CVE-2014-3566) not vulnerable (OK) TLS_FALLBACK_SCSV (RFC 7507) Downgrade attack prevention supported (OK) SWEET32 (CVE-2016-2183, CVE-2016-6329) VULNERABLE, uses 64 bit block ciphers 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=2C2A0BDD33A869054C1FEF23E6CF1ABFC5BDFE0B7326CB1F1B9212D32E4CF9EE LOGJAM (CVE-2015-4000), experimental not vulnerable (OK): no DH EXPORT ciphers, no DH key detected with <= TLS 1.2 BEAST (CVE-2011-3389) TLS1: ECDHE-RSA-AES128-SHA AES128-SHA ECDHE-RSA-AES256-SHA AES256-SHA DES-CBC3-SHA VULNERABLE -- but also supports higher protocols TLSv1.1 TLSv1.2 (likely mitigated) 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 2026-10-09 21:12:24 [ 134s] -->> 104.26.2.143:443 (cdn.tailwindcss.com) <<-- ----------------------------------------------------- Start 2026-10-09 21:12:24 -->> 172.67.68.11:443 (cdn.tailwindcss.com) <<-- Further IP addresses: 104.26.3.143 104.26.2.143 2606:4700:20::681a:28f 2606:4700:20::681a:38f 2606:4700:20::ac43:440b rDNS (172.67.68.11): -- Service detected: HTTP Testing for server implementation bugs No bugs found. Testing HTTP header response @ "/" HTTP Status Code 302 Found, redirecting to "" HTTP clock skew +410 sec from localtime HTTP Age (RFC 7234) 410 Strict Transport Security 730 days=63072000 s, just this domain Public Key Pinning -- Server banner cloudflare Application banner -- Cookie(s) (none issued at "/") -- maybe better try target URL of 30x Security headers Cache-Control: max-age=14400 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) no gzip/deflate/compress/br HTTP compression (OK) - only supplied "/" tested POODLE, SSL (CVE-2014-3566) not vulnerable (OK) TLS_FALLBACK_SCSV (RFC 7507) Downgrade attack prevention supported (OK) SWEET32 (CVE-2016-2183, CVE-2016-6329) VULNERABLE, uses 64 bit block ciphers 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=2C2A0BDD33A869054C1FEF23E6CF1ABFC5BDFE0B7326CB1F1B9212D32E4CF9EE LOGJAM (CVE-2015-4000), experimental not vulnerable (OK): no DH EXPORT ciphers, no DH key detected with <= TLS 1.2 BEAST (CVE-2011-3389) TLS1: ECDHE-RSA-AES128-SHA AES128-SHA ECDHE-RSA-AES256-SHA AES256-SHA DES-CBC3-SHA VULNERABLE -- but also supports higher protocols TLSv1.1 TLSv1.2 (likely mitigated) 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 2026-10-09 21:13:15 [ 185s] -->> 172.67.68.11:443 (cdn.tailwindcss.com) <<-- ----------------------------------------------------- Done testing now all IP addresses (on port 443): 104.26.3.143 104.26.2.143 172.67.68.11
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.