CVE-2025-53020 Apache HTTP Server: HTTP/2 DoS by Memory Increase

Late Release of Memory after Effective Lifetime vulnerability in Apache HTTP Server. This issue affects Apache HTTP Server: from 2.4.17 up to 2.4.63. Users are recommended to upgrade to version 2.4.64, which fixes the issue...

CVE-2025-53020

Late Release of Memory after Effective Lifetime vulnerability in Apache HTTP Server. This issue affects Apache HTTP Server: from 2.4.17 up to 2.4.63. Users are recommended to upgrade to version 2.4.64, which fixes the issue...

CVE-2025-53020

Apache HTTP Server versions 2.4.17 through 2.4.63 are vulnerable to a memory exhaustion denial of service (DoS) via the HTTP/2 implementation. The root cause is a late release of memory after its effective lifetime, specifically occurring when processing repeated header names in HTTP/2 requests. ...

CVE-2025-53020 Apache HTTP Server: HTTP/2 DoS by Memory Increase

Late Release of Memory after Effective Lifetime vulnerability in Apache HTTP Server. This issue affects Apache HTTP Server: from 2.4.17 up to 2.4.63. Users are recommended to upgrade to version 2.4.64, which fixes the issue...

CVE-2025-53020

Late Release of Memory after Effective Lifetime vulnerability in Apache HTTP Server. This issue affects Apache HTTP Server: from 2.4.17 up to 2.4.63. Users are recommended to upgrade to version 2.4.64, which fixes the issue...

CVE-2025-49812 Apache HTTP Server: mod_ssl TLS upgrade attack

In some modssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade. Only configurations using "SSLEngine optional" to enable TLS upgrades are affected. Users are recommend...

CVE-2025-49812

Apache HTTP Server versions through 2.4.63 are vulnerable to an HTTP desynchronisation attack via mod_ssl . Specifically, a man-in-the-middle attacker can hijack an HTTP session using a TLS upgrade . This issue only affects configurations where "SSLEngine optional" is used to enable TLS upgrades....

CVE-2025-49812

In some modssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade. Only configurations using "SSLEngine optional" to enable TLS upgrades are affected. Users are recommend...

CVE-2025-49812

In some modssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade. Only configurations using "SSLEngine optional" to enable TLS upgrades are affected. Users are recommend...

CVE-2025-49812 Apache HTTP Server: mod_ssl TLS upgrade attack

In some modssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade. Only configurations using "SSLEngine optional" to enable TLS upgrades are affected. Users are recommend...

CVE-2025-49812 Apache HTTP Server: mod_ssl TLS upgrade attack

In some modssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade. Only configurations using "SSLEngine optional" to enable TLS upgrades are affected. Users are recommend...

CVE-2025-49812

In some modssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade. Only configurations using "SSLEngine optional" to enable TLS upgrades are affected. Users are recommend...

CVE-2025-49630 Apache HTTP Server: mod_proxy_http2 denial of service

In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in modproxyhttp2. Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with...

CVE-2025-49630

In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in modproxyhttp2. Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with...

CVE-2025-49630 Apache HTTP Server: mod_proxy_http2 denial of service

In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in modproxyhttp2. Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with...

CVE-2025-49630 Apache HTTP Server: mod_proxy_http2 denial of service

In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in modproxyhttp2. Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with...

CVE-2025-49630

The Apache HTTP Server (versions 2.4.26 through 2.4.63) is vulnerable to a denial of service (DoS) attack due to a reachable assertion in the mod_proxy_http2 module. This issue can be triggered by untrusted clients in specific proxy configurations, specifically when a reverse proxy is configured ...

CVE-2025-49630

In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in modproxyhttp2. Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with...

CVE-2025-23048 Apache HTTP Server: mod_ssl access control bypass with session resumption

In some modssl configurations on Apache HTTP Server 2.4.35 through to 2.4.63, an access control bypass by trusted clients is possible using TLS 1.3 session resumption. Configurations are affected when modssl is configured for multiple virtual hosts, with each restricted to a different set of...

CVE-2025-23048 Apache HTTP Server: mod_ssl access control bypass with session resumption

In some modssl configurations on Apache HTTP Server 2.4.35 through to 2.4.63, an access control bypass by trusted clients is possible using TLS 1.3 session resumption. Configurations are affected when modssl is configured for multiple virtual hosts, with each restricted to a different set of...