Off-by-one Error in v2fly/v2ray-core
Priority MEDIUM 41CWE-193Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.
Why it matters now
EPSS 0.00858 58th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed v2fly/v2ray-core (v2fly): 4.44.0github.com/v2fly/v2ray-core/v4 (Go): 4.44.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| v2fly | v2fly/v2ray-core | before 4.44.0 | 4.44.0 | Patch available | CNA |
| — | github.com/v2fly/v2ray-core/v4 (Go) | before 4.44.0 | 4.44.0 | Patch available | GHSA-4cxw-hq44-r344 |
| — | github.com/v2fly/v2ray-core (Go) | all versions | — | No fix listed | GHSA-4cxw-hq44-r344 |
- v2fly/v2ray-core Vendorv2fly Affected before 4.44.0 Fixed in 4.44.0 Patch available CNA
- github.com/v2fly/v2ray-core/v4 (Go) Vendor— Affected before 4.44.0 Fixed in 4.44.0 Patch available GHSA-4cxw-hq44-r344
- github.com/v2fly/v2ray-core (Go) Vendor— Affected all versions Fixed in — No fix listed GHSA-4cxw-hq44-r344
Remediation
- Fix · CNA v2fly/v2ray-core (v2fly) Fixed in 4.44.0
- Fix · GHSA-4cxw-hq44-r344 github.com/v2fly/v2ray-core/v4 (Go) Fixed in 4.44.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-4070
- 2026-10-03 Alias added: GHSA-4cxw-hq44-r344
References
Sources
- CVE-2021-4070 · CVE Program
- CVE-2021-4070 · NVD
- FIRST EPSS
- GHSA-4cxw-hq44-r344 · GitHub Advisory Database · CC BY 4.0
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