CVE-2016-1546 Denial of service in n/a

What is CVE-2016-1546?

CVE-2016-1546 is a medium-severity denial of service vulnerability in Apache Http Server, published on 6 Jul 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The Apache HTTP Server 2.4.17 and 2.4.18, when mod_http2 is enabled, does not limit the number of simultaneous stream workers for a single HTTP/2 connection, which allows remote attackers to cause a denial of service (stream-processing outage) via modified flow-control windows.

Weakness: CWE-399

Which versions are affected by CVE-2016-1546?

It affects 1 product.

Products include Apache Http Server.

How do I fix CVE-2016-1546?

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-2016-1546 being exploited?

There is no known exploitation of CVE-2016-1546 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 DEBIAN-CVE-2016-1546, GHSA-f6fj-787v-v59m.