https://cve.radiocsirt.org Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Mon, 05 Oct 2026 13:45:58 +0000 https://cve.radiocsirt.org/vuln/cve-2021-38507 <p><strong>Affected:</strong> Mozilla Firefox, Mozilla Thunderbird, Mozilla Firefox ESR</p> <p>The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded to TLS while retaining the visual properties of an HTTP connection, including being same-origin with unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port 8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage. This vulnerability affects Firefox &lt; 94, Thunderbird &lt; 91.3, and Firefox ESR &lt; 91.3.</p> <p><strong>Affected:</strong> Mozilla Firefox, Mozilla Thunderbird, Mozilla Firefox ESR</p> <p>The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded to TLS while retaining the visual properties of an HTTP connection, including being same-origin with unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port 8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage. This vulnerability affects Firefox &lt; 94, Thunderbird &lt; 91.3, and Firefox ESR &lt; 91.3.</p> https://cve.radiocsirt.org/vuln/cve-2021-38507