CVE-2019-0211
Published: November 3, 2021
Official Description
Apache HTTP Server, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interpreter) could execute code with the privileges of the parent process (usually root) by manipulating the scoreboard.
CISA KEV Advisory
Apache HTTP Server Privilege Escalation Vulnerability
Apache HTTP Server, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interpreter) could execute code with the privileges of the parent process (usually root) by manipulating the scoreboard.
Apply updates per vendor instructions.
Risk Analysis
This vulnerability in Apache HTTP Server (MPM event, worker, or prefork) allows less-privileged child processes to escalate privileges to the parent process (often root) by manipulating the scoreboard. Its high EPSS score of 0.89451 and inclusion in CISA's KEV confirm active exploitation, making it a severe privilege escalation risk.
This vulnerability has been actively exploited in the wild and is included in CISA's KEV, confirming its use in real-world attacks. While requiring initial access, it allows for significant privilege escalation.
Administrators should update Apache HTTP Server to a patched version to mitigate this privilege escalation vulnerability. Ensure all Apache installations are regularly updated and configured with the principle of least privilege.
Technical Analysis
CVE-2019-0211 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2019-0211 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2019-0211 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1