HTTP Response Splitting Affecting apache/httpd package, versions [2.4.0, 2.4.64-rc1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published3 Aug 2025
- disclosed14 Jul 2025
- creditUnknown
Introduced: 14 Jul 2025
CVE-2024-42516 (opens in a new tab)How to fix?
Upgrade apache/httpd to version 2.4.64-rc1 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Response Splitting via improper header sanitization in ap_http_header_filter(). An attacker can manipulate client-side behavior, including caching or redirection, by injecting values such as Content-Type or Content-Encoding into response headers. This is only exploitable if the attacker can control the backend responses through a compromised backend or proxied services.
Note: This vulnerability results from an incomplete patch for CVE-2023-38709.