Apache · HTTP Server
CVE-2019-0211
Apache HTTP Server Privilege Escalation Vulnerability
What it is
In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, 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 arbitrary code with the privileges of the parent process (usually root) by manipulating the scoreboard. Non-Unix systems are not affected.
CISA: 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.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: May 3, 2022
- Added to the CISA list
- November 3, 2021
- Published
- April 8, 2019
- Severity
- High 7.8 CVSS 3.1
- Chance of attacks in the next 30 days (EPSS)
- 65% in the top 0.8% of all known vulnerabilities
- Weakness
- CWE-416
- More details
- NVD · CVE.org · CISA
All references (20)
- https://usn.ubuntu.com/3937-1/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WETXNQWNQLWH…
- https://www.debian.org/security/2019/dsa-4422
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EZRMTEIGZKYF…
- https://access.redhat.com/errata/RHSA-2019:0746
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00051.html
- http://www.openwall.com/lists/oss-security/2019/04/02/3
- http://www.securityfocus.com/bid/107666
- https://seclists.org/bugtraq/2019/Apr/5
- https://www.synology.com/security/advisory/Synology_SA_19_14
- http://packetstormsecurity.com/files/152386/Apache-2.4.38-Root-Privilege-Escalation.html
- https://lists.apache.org/thread.html/b1613d44ec364c87bb7ee8c5939949f9b061c05c06e0e90098ebf7aa%40%3Cusers.http…
- https://seclists.org/bugtraq/2019/Apr/16
- https://www.exploit-db.com/exploits/46676/
- https://httpd.apache.org/security/vulnerabilities_24.html
- http://packetstormsecurity.com/files/152415/Slackware-Security-Advisory-httpd-Updates.html
- http://packetstormsecurity.com/files/152441/CARPE-DIEM-Apache-2.4.x-Local-Privilege-Escalation.html
- http://www.apache.org/dist/httpd/CHANGES_2.4.39
- https://lists.apache.org/thread.html/890507b85c30adf133216b299cc35cd8cd0346a885acfc671c04694e%40%3Cdev.commun…
- https://lists.apache.org/thread.html/b2bdb308dc015e771ba79c0586b2de6fb50caa98b109833f5d4daf28%40%3Cdev.commun…
More exploited flaws from Apache
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| May 1, 2025 | Improper Escaping of Output | HTTP Server | Critical 9.1 | >99.9% |
| Nov 3, 2021 | Path Traversal | HTTP Server | High 7.5 | >99.9% |
| Nov 3, 2021 | Path Traversal | HTTP Server | Critical 9.8 | >99.9% |
| Oct 8, 2026 | Command Injection | Struts | High 8.1 | 97% |
| Aug 4, 2026 | Missing Encryption of Sensitive Data | Tomcat | High 7.5 | 99% |
| Apr 16, 2026 | Improper Input Validation | ActiveMQ | High 8.8 | 98% |
| Apr 1, 2025 | Path Equivalence | Tomcat | Critical 10.0 | 99.9% |
| Feb 4, 2025 | Forced Browsing | OFBiz | Critical 9.8 | >99.9% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.