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

EPSS 0.45% · P64
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I. Basic Information for CVE-2025-49812

Vulnerability Information
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Vulnerability Title
Apache HTTP Server: mod_ssl TLS upgrade attack
Source: NVD (National Vulnerability Database)
Vulnerability Description
In some mod_ssl 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 recommended to upgrade to version 2.4.64, which removes support for TLS upgrade.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Apache HTTP Server 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache HTTP Server是美国阿帕奇（Apache）基金会的一款开源网页服务器。该服务器具有快速、可靠且可通过简单的API进行扩充的特点。 Apache HTTP Server 2.4.63及之前版本存在授权问题漏洞，该漏洞源于mod_ssl配置不当，可能导致HTTP会话劫持。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Apache Software FoundationApache HTTP Server 0 ~ 2.4.63 -

II. Public POCs for CVE-2025-49812

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III. Intelligence Information for CVE-2025-49812

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Same Patch Batch · Apache Software Foundation · 2025-07-10 · 11 CVEs total

CVE-2024-42516Apache HTTP Server: HTTP response splitting
CVE-2024-43204Apache HTTP Server: SSRF with mod_headers setting Content-Type header
CVE-2024-47252Apache HTTP Server: mod_ssl error log variable escaping
CVE-2024-43394Apache HTTP Server: SSRF on Windows due to UNC paths
CVE-2025-23048Apache HTTP Server: mod_ssl access control bypass with session resumption
CVE-2025-49630Apache HTTP Server: mod_proxy_http2 denial of service
CVE-2025-53020Apache HTTP Server: HTTP/2 DoS by Memory Increase
CVE-2025-52434Apache Tomcat: APR/Native Connector crash leading to DoS
CVE-2025-52520Apache Tomcat: DoS via integer overflow in multipart file upload
CVE-2025-53506Apache Tomcat: DoS via excessive h2 streams at connection start

IV. Related Vulnerabilities

Same product: Apache HTTP Server
Same vendor: Apache Software Foundation
Same weakness: CWE-287

V. Comments for CVE-2025-49812

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