Skip to main content
HIGH

CVE-2018-1303

CVSS v3

7.5

HIGH

EPSS Score

69.8 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Get an alert for each new CVE published for httpd.

Set up CVE WatchFree account · no credit card

Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2018-1303 Red Hat Product Security506 products fixed · 6 known affected

    httpd: Out of bounds read in mod_cache_socache can allow a remote attacker to cause DoS

    httpd as a component of Red Hat Enterprise Linux 6 · httpd-devel as a component of Red Hat Enterprise Linux 6 · httpd-manual as a component of Red Hat Enterprise Linux 6

  • RHSA-2020:3958 Red Hat Product Security69 products fixed

    Red Hat Security Advisory: httpd security, bug fix, and enhancement update

  • RHSA-2019:0367 Red Hat Product Security138 products fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.29 security update

  • RHSA-2019:0366 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.29 SP1 security update

  • RHSA-2018:3558 Red Hat Product Security298 products fixed

    Red Hat Security Advisory: httpd24 security, bug fix, and enhancement update

Full record on NVD

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.

Technical details

Published
2018-03-26

Frequently asked questions

What is CVE-2018-1303?

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.

Is CVE-2018-1303 actively exploited?

Active exploitation of CVE-2018-1303 has not been confirmed. Its EPSS score was 69.8% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-1303?

CVE-2018-1303 has a CVSS v3 base score of 7.5 (HIGH severity).

Running httpd? Hear about its next vulnerability

CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.

Get alerts for this productCISA KEV additions, October 2026Search CVEs

Already have an account? Open CVE WatchNo credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database