# CVE-2021-46873: WireGuard: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVE-2021-46873 is fixed in WireGuard on 1 platform by WireGuard 0.6.1 (version 0.6.1), released April 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-46873
- Priority: Routine
- CVSS: 5.3
- EPSS: 0.0047
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 29, 2023
- Weakness: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-46873

## Description

WireGuard, such as WireGuard 0.5.3 on Windows, does not fully account for the possibility that an adversary might be able to set a victim's system time to a future value, e.g., because unauthenticated NTP is used. This can lead to an outcome in which one static private key becomes permanently useless.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | WireGuard | 0.6.1 | [WireGuard 0.6.1](https://patchblox.com/security/data/fix/windows-app/wireguard.wireguard-0.6.1.md) | Apr 10, 2026 |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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