CVE-2021-26691 Explained : Impact and Mitigation
Discover a heap overflow vulnerability in Apache HTTP Server versions 2.4.0 to 2.4.46. Learn about the impact, affected systems, and mitigation steps for CVE-2021-26691.
Apache HTTP Server mod_session response handling heap overflow.
Understanding CVE-2021-26691
A heap overflow vulnerability in Apache HTTP Server versions 2.4.0 to 2.4.46.
What is CVE-2021-26691?
A specially crafted SessionHeader sent by an origin server could lead to a heap overflow in Apache HTTP Server.
The Impact of CVE-2021-26691
The vulnerability has been rated as low severity.
Technical Details of CVE-2021-26691
Detailed technical information about the vulnerability.
Vulnerability Description
Apache HTTP Server is affected by a heap-based buffer overflow (CWE-122) due to improper handling of SessionHeader.
Affected Systems and Versions
The vulnerability affects Apache HTTP Server versions 2.4.0 to 2.4.46.
Exploitation Mechanism
An attacker can exploit this vulnerability by sending a specially crafted SessionHeader, leading to a heap overflow.
Mitigation and Prevention
Learn how to protect your systems from CVE-2021-26691.
Immediate Steps to Take
Update Apache HTTP Server to a non-vulnerable version and apply patches.
Long-Term Security Practices
Regularly update and patch your Apache HTTP Server installations to mitigate the risk of heap overflow vulnerabilities.
Patching and Updates
Stay informed about security updates and apply patches promptly to secure your systems.