CVE-2026-63089 PUBLISHED

WireGuard Easy Weak Token Generation Information Disclosure via OTL Route

Assigner: VulnCheck
Reserved: 15.07.2026 Published: 16.07.2026 Updated: 16.07.2026

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.

Metrics

CVSS Vector: 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
CVSS Score: 9

Product Status

Vendor wg-easy
Product wg-easy
Versions Default: affected
  • affected from 0 to 15.3.0 (incl.)
  • Version 66b292b11bde3664f05ffb016c8082665d261ded is unaffected

Credits

  • George Chen finder

References

Problem Types

  • Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) CWE
  • Insufficient Session Expiration CWE