CVE-2018-1303 Denial of service in Apache HTTP Server

What is CVE-2018-1303?

CVE-2018-1303 is a high-severity denial of service vulnerability in Apache Http Server, published on 26 Mar 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A specially crafted HTTP request header could have crashed the Apache HTTP Server prior to version 2.4.30 due to an out of bound read while preparing data to be cached in shared memory. It could be used as a Denial of Service attack against users of mod_cache_socache. The vulnerability is considered as low risk since mod_cache_socache is not widely used, mod_cache_disk is not concerned by this vulnerability.

Weakness: CWE-125

Which versions are affected by CVE-2018-1303?

It affects 7 products.

Products include Apache Http Server, Canonical Ubuntu Linux, Debian Debian Linux, Netapp Clustered Data Ontap, Netapp Santricity Cloud Connector, Netapp Storage Automation Store and 1 more.

How do I fix CVE-2018-1303?

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-2018-1303 being exploited?

There is no known exploitation of CVE-2018-1303 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-2018-1303, CLEANSTART-2026-MQ00302, DEBIAN-CVE-2018-1303, GHSA-8rrj-w45x-2fr2, UBUNTU-CVE-2018-1303.