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CVE-2026-63089

WireGuard Easy Weak Token Generation Information Disclosure via OTL Route

Critical9.0EPSS 0.41%
Published
Updated
Reserved
Assigned by
VulnCheck

Description

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.

Timeline

  1. ID reserved

    By VulnCheck

  2. · 1 day later

    Published

  3. · 2 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-63089, by who scored it
Scored byCVSSScoreVector
VulnCheckCNA (assigner)4.0Critical9.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:L/SA:N
VulnCheckCNA (assigner)3.1Critical9.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
NVDNVD · Deferred4.0Critical9.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
0.41% · top 64% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.0.

Weakness

Affected products

  • wg-easy · wg-easy

    • affected ≤ 15.3.0
    • unaffected 66b292b11bde3664f05ffb016c8082665d261ded

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .