CVE-2016-4864
UnknownEPSS 1.80%
Last modified
CVE-2016-4864 is a vulnerability of currently unknown severity. H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.. EPSS estimates a 1.80% chance of exploitation in the next 30 days.
Description
H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Dena | H2o | >= 2.0.0, <= 2.0.3 |
| Dena | H2o | 2.1.0 |
References
- https://github.com/h2o/h2o/issues/1077Patch, Third Party Advisory
- https://jvn.jp/en/jp/JVN94779084/index.htmlThird Party Advisory, VDB Entry
- https://github.com/h2o/h2o/issues/1077Patch, Third Party Advisory
- https://jvn.jp/en/jp/JVN94779084/index.htmlThird Party Advisory, VDB Entry
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2016-4864?
H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.
How severe is CVE-2016-4864?
Severity scoring for CVE-2016-4864 is pending analysis. The EPSS model estimates a 1.80% probability of exploitation in the next 30 days.
How do I fix CVE-2016-4864?
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.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2016-4864?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST