CVE-2021-4070 Off-by-one Error in v2fly/v2ray-core
An off-by-one error in the v2ray-core library allows attackers to cause denial of service or potentially execute code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-4070?
CVE-2021-4070 is a medium-severity vulnerability in v2fly/v2ray-core, published on 23 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.
Weakness: CWE-193
Which versions are affected by CVE-2021-4070?
6 open source packages ship an affected version, including github.com/v2fly/v2ray-core and github.com/v2fly/v2ray-core/v4. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/v2fly/v2ray-core Go | All versions | None |
github.com/v2fly/v2ray-core Go | All versions | None |
github.com/v2fly/v2ray-core Go | All versions | None |
github.com/v2fly/v2ray-core/v4 Go | All versions | 4.44.0 |
github.com/v2fly/v2ray-core/v4 Go | All versions | 4.44.0 |
github.com/v2fly/v2ray-core/v4 Go | All versions | 4.44.0 |
Products include V2fly V2ray-Core.
How do I fix CVE-2021-4070?
Upgrade to a fixed version.
Is CVE-2021-4070 being exploited?
There is no known exploitation of CVE-2021-4070 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2021-4070, GHSA-4cxw-hq44-r344, GO-2022-0550, UBUNTU-CVE-2021-4070.