CVE-2018-1333 — By specially crafting HTTP/2 requests, workers would be allocated 60 seconds lon

By specially crafting HTTP/2 requests, workers would be allocated 60 seconds longer than necessary, leading to worker exhaustion and a denial of service. Fixed in Apache HTTP Server 2.4.34 (Affected 2.4.18-2.4.30,2.4.33).

01What is this vulnerability?

By specially crafting HTTP/2 requests, workers would be allocated 60 seconds longer than necessary, leading to worker exhaustion and a denial of service. Fixed in Apache HTTP Server 2.4.34 (Affected 2.4.18-2.4.30,2.4.33).

02Affected products

Vendor	Product	Versions
Apache Software Foundation	Apache HTTP Server	Fixed in Apache HTTP Server 2.4.34 (Affected 2.4.18-2.4.30,2.4.33)

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2018-06-18T18:00:00.000Z
• Last modified: 2024-09-17T04:09:37.340Z

09References

• access.redhat.com — https://access.redhat.com/errata/RHSA-2018:3558
• support.hpe.com — https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpe…
• access.redhat.com — https://access.redhat.com/errata/RHSA-2019:0367
• security.netapp.com — https://security.netapp.com/advisory/ntap-20180926-0007/
• httpd.apache.org — https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2018-1333
• usn.ubuntu.com — https://usn.ubuntu.com/3783-1/
• www.securitytracker.com — http://www.securitytracker.com/id/1041402
• access.redhat.com — https://access.redhat.com/errata/RHSA-2019:0366
• lists.apache.org — https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cd…
• lists.apache.org — https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e10…
• www.tenable.com — https://www.tenable.com/security/tns-2019-09
• lists.apache.org — https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0…
• lists.apache.org — https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cac…
• lists.apache.org — https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90b…
• lists.apache.org — https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda…
• lists.apache.org — https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa…
• lists.apache.org — https://lists.apache.org/thread.html/r15f9aa4427581a1aecb4063f1b4b983511ae1c9935…
• lists.apache.org — https://lists.apache.org/thread.html/rd2fb621142e7fa187cfe12d7137bf66e7234abcbbc…
• lists.apache.org — https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f8…
• lists.apache.org — https://lists.apache.org/thread.html/re473305a65b4db888e3556e4dae10c2a04ee89dcff…
• lists.apache.org — https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37…