CVE-2021-4070
CRITICALCVSS 9.1/10EPSS 0.85%
Last modified
CVE-2021-4070 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.. EPSS estimates a 0.85% chance of exploitation in the next 30 days.
Description
Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| V2fly | V2ray-Core | < 4.44.0 |
References
- https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5cPatch, Third Party Advisory
- https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877Exploit, Patch, Third Party Advisory
- https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5cPatch, Third Party Advisory
- https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877Exploit, Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-4070?
Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.
How severe is CVE-2021-4070?
CVE-2021-4070 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.85% probability of exploitation in the next 30 days.
How do I fix CVE-2021-4070?
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-2021-4070?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST