CVE-2026-63089CWE-338CWE-613

WireGuard Easy Weak Token Generation Information Disclosure via OTL Route

Critical · published July 16, 2026

CVSS v4.0
9.0
EPSS
0%
Percentile
34.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
9.0 · CRITICAL
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
EPSS
0.00414 · 34.6th percentile
Weaknesses
CWE-338 · Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG); CWE-613 · Insufficient Session Expiration
Published
2026-07-16T19:28Z
EPSS history
Timeline
  • 16 JUL 19:28Z
    WireGuard Easy Weak Token Generation Information Disclosure via OTL Route
    cvelistv5