Threat Advisory

Apache HTTP Server Vulnerability Allows Remote Execution

Threat: Vulnerability
Targeted Region: Global
Targeted Sector: Technology & IT
Criticality: Critical
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EXECUTIVE SUMMARY:

Multiple security vulnerabilities have been identified in Apache HTTP Server versions 2.4.0 through 2.4.67. The defects span buffer overflow, heap underflow, and denial‑of‑service weaknesses that can be triggered by maliciously crafted HTTP requests or manipulated backend content. Exploitation may cause process crashes, remote code execution, or service interruption, exposing organizations to data loss, downtime, and reputational damage. The risk is amplified for public‑facing web portals and API gateways that handle untrusted traffic, where attackers could leverage these flaws to compromise confidentiality or availability of critical services.[/subscribe_to_unlock_form]

EXECUTIVE SUMMARY:

Multiple security vulnerabilities have been identified in Apache HTTP Server versions 2.4.0 through 2.4.67. The defects span buffer overflow, heap underflow, and denial‑of‑service weaknesses that can be triggered by maliciously crafted HTTP requests or manipulated backend content. Exploitation may cause process crashes, remote code execution, or service interruption, exposing organizations to data loss, downtime, and reputational damage. The risk is amplified for public‑facing web portals and API gateways that handle untrusted traffic, where attackers could leverage these flaws to compromise confidentiality or availability of critical services.[emaillocker id="1283"]

  • CVE-2026-34355 – A buffer overflow in the proxy HTML filter allows a malicious backend server to craft HTML content that overwrites memory, leading to host process termination; exploitation requires control of the backend response.
    • CVE-2026-34356 – An overflow in the reverse cookie mapping mechanism permits an untrusted backend to corrupt internal structures, causing crashes or potential code execution; attacker must supply crafted cookies.
    • CVE-2026-44631 – A character overflow in regular‑expression parsing results in a heap underwrite that can be triggered by specially crafted regex patterns, allowing remote denial‑of‑service; no authentication is needed.
    • CVE-2025-54472 – The Apache bRPC component suffers a remote denial‑of‑service flaw where malformed RPC calls exhaust server resources, enabling attackers to disrupt service without prior access.

These vulnerabilities collectively present an urgent threat to any organization running unpatched Apache HTTP Server, as exploitation can lead to service outages or unauthorized code execution. Failure to address them promptly could result in prolonged downtime, loss of customer trust, and potential regulatory penalties. The high severity and active exploitation landscape demand immediate executive attention to protect critical web services.

RECOMMENDATION:

  • We recommend you to update Apache HTTP Server to version 2.4.68.

REFERENCES:

The following reports contain further technical details:
https://securityonline.info/apache-http-server-patches/

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