CVE-2019-0197 Denial of service in Apache HTTP Server

What is CVE-2019-0197?

CVE-2019-0197 is a medium-severity denial of service vulnerability in Apache Http Server, published on 11 Jun 2019. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability was found in Apache HTTP Server 2.4.34 to 2.4.38. When HTTP/2 was enabled for a http: host or H2Upgrade was enabled for h2 on a https: host, an Upgrade request from http/1.1 to http/2 that was not the first request on a connection could lead to a misconfiguration and crash. Server that never enabled the h2 protocol or that only enabled it for https: and did not set "H2Upgrade on" are unaffected by this issue.

Weakness: CWE-444

Which versions are affected by CVE-2019-0197?

It affects 11 products.

Products include Apache Http Server, Canonical Ubuntu Linux, Fedoraproject Fedora, Opensuse Leap, Oracle Communications Session Report Manager, Oracle Communications Session Route Manager and 5 more.

How do I fix CVE-2019-0197?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-0197 being exploited?

There is no known exploitation of CVE-2019-0197 in the wild and no public exploit code.

Other vulnerabilities in Apache Http Server

• CVE-2021-42013 Apache HTTP Server Path Traversal Exploited Critical 9.8
• CVE-2024-38475 Apache HTTP Server Improper Escaping of Output Exploited Critical 9.1
• CVE-2021-40438 Apache HTTP Server-Side Request Forgery (SSRF) Exploited Critical 9.0
• CVE-2019-0211 Apache HTTP Server Privilege Escalation Exploited High 7.8
• CVE-2021-41773 Apache HTTP Server Path Traversal Exploited High 7.5

All Apache Http Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2019-0197, CLEANSTART-2026-ZL75334, DEBIAN-CVE-2019-0197, GHSA-g33m-gfwr-29g4, UBUNTU-CVE-2019-0197.