CVE-2026-33857 Details
Description
Out-of-bounds Read vulnerability in mod_proxy_ajp of Apache HTTP Server. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.
A memory corruption vulnerability allowing for out-of-bounds read has been identified in the AJP (Apache JServ Protocol) handling of Apache HTTP Server. This vulnerability affects versions through 2.4.66 and arises from improper validation of AJP messages, which can be exploited by a malicious AJP server to read memory beyond the intended buffer limits. The issue is particularly relevant in environments where mod_proxy_ajp is used to connect to untrusted AJP servers.
Users are advised to upgrade to Apache HTTP Server version 2.4.67, which addresses this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 4, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2026/05/04/15 | CVE | Mailing ListThird Party Advisory |
| https://httpd.apache.org/security/vulnerabilities_24.html | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| apache http server | < 2.4.67 |
CPE
Remediation
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Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 4, 2026 | Initial Analysis | [email protected] |
| May 4, 2026 | CVE Modified | CVE |
| May 4, 2026 | New CVE Received | [email protected] |
| May 4, 2026 | CVE Modified | CISA-ADP |