Apache HTTP Server: buffer overflow in mod_proxy_ajp via ajp_msg_check_header()
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.8epss 1.4%
exploitation probability
1.4%top 31% of all CVEs
observed exploitation
nono source reports it
Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server.
If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer.
This issue affects Apache HTTP Server: through 2.4.66.
Users are recommended to upgrade to version 2.4.67, which fixes the issue.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Apache Software Foundation · Apache HTTP ServerReferences
https://access.redhat.com/errata/RHSA-2026:21391https://access.redhat.com/errata/RHSA-2026:21433https://access.redhat.com/errata/RHSA-2026:22140https://access.redhat.com/errata/RHSA-2026:27200https://access.redhat.com/errata/RHSA-2026:27201https://access.redhat.com/errata/RHSA-2026:36373https://access.redhat.com/errata/RHSA-2026:36831https://access.redhat.com/errata/RHSA-2026:36846https://access.redhat.com/errata/RHSA-2026:47046https://access.redhat.com/security/cve/CVE-2026-28780https://bugzilla.redhat.com/show_bug.cgi?id=2466913https://httpd.apache.org/security/vulnerabilities_24.html