CVE-2026-63089
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:L/SA:N
Summary
WireGuard Easy through 15.3.0, fixed in commit 66b292b, contains a cryptographically weak one-time link token generation vulnerability that allows unauthenticated network attackers to recover WireGuard peer credentials by brute-forcing a keyspace of at most 1000 candidate tokens per client ID, as the token is computed using CRC32 over a random value constrained to 0-999. Attackers can enumerate candidate tokens against the unauthenticated /cnf/:oneTimeLink route, which lacks rate limiting and does not validate token expiration, to obtain a peer's PrivateKey and PresharedKey and impersonate that peer on the VPN network.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| wg-easy | wg-easy | 0 <= 15.3.0 | affected |
| wg-easy | wg-easy | 66b292b11bde3664f05ffb016c8082665d261ded | unaffected |
Weaknesses
- CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
- CWE-613: Insufficient Session Expiration
References
- https://github.com/wg-easy/wg-easy/pull/2661
- https://github.com/wg-easy/wg-easy/commit/66b292b11bde3664f05ffb016c8082665d261ded
- https://www.vulncheck.com/advisories/wireguard-easy-weak-token-generation-information-disclosure-via-otl-route
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