CVE-2018-6335
HIGHCVSS 7.5/10EPSS 1.47%
Last modified
CVE-2018-6335 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A Malformed h2 frame can cause 'std::out_of_range' exception when parsing priority meta data. This behavior can lead to denial-of-service. EPSS estimates a 1.47% chance of exploitation in the next 30 days.
Description
A Malformed h2 frame can cause 'std::out_of_range' exception when parsing priority meta data. This behavior can lead to denial-of-service. This affects all supported versions of HHVM (3.25.2, 3.24.6, and 3.21.10 and below) when using the proxygen server to handle HTTP2 requests.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Hhvm | <= 3.21.10 | |
| Hhvm | 3.24.6 | |
| Hhvm | 3.25.2 |
References
- https://github.com/facebook/hhvm/commit/4cb57dd753a339654ca464c139db9871fe961d56Patch, Third Party Advisory
- https://hhvm.com/blog/2018/05/04/hhvm-3.25.3.htmlVendor Advisory
- https://github.com/facebook/hhvm/commit/4cb57dd753a339654ca464c139db9871fe961d56Patch, Third Party Advisory
- https://hhvm.com/blog/2018/05/04/hhvm-3.25.3.htmlVendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2018-6335?
A Malformed h2 frame can cause 'std::out_of_range' exception when parsing priority meta data. This behavior can lead to denial-of-service. This affects all supported versions of HHVM (3.25.2, 3.24.6, and 3.21.10 and below) when using the proxygen server to handle HTTP2 requests.
How severe is CVE-2018-6335?
CVE-2018-6335 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.47% probability of exploitation in the next 30 days.
How do I fix CVE-2018-6335?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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Are you affected by CVE-2018-6335?
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Scan your code nowSource: NVD / NIST