# CVE-2021-4070: golang-v2ray-core: Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.

CVE-2021-4070 is fixed in golang-v2ray-core on 1 platform, first by DEBIAN-CVE-2021-4070, released February 23, 2022. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2021-4070
- Priority: Urgent
- CVSS: 9.1 (critical)
- EPSS: 0.0086
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 23, 2022

## Description

Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | golang-v2ray-core Debian 12.15 (bookworm) | 4.34.0-7 | [DEBIAN-CVE-2021-4070](https://patchblox.com/security/data/fix/linux/debian-cve-2021-4070.md) | Feb 23, 2022 |
| Linux | golang-v2ray-core Debian 13.5 (trixie) | 4.34.0-7 | [DEBIAN-CVE-2021-4070](https://patchblox.com/security/data/fix/linux/debian-cve-2021-4070.md) | Feb 23, 2022 |
| Linux | golang-v2ray-core Debian 14 | 4.34.0-7 | [DEBIAN-CVE-2021-4070](https://patchblox.com/security/data/fix/linux/debian-cve-2021-4070.md) | Feb 23, 2022 |

---

Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.