CVE-2021-40818

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

scheme/webauthn.c in Glewlwyd SSO server through 2.5.3 has a buffer overflow during FIDO2 signature validation in webauthn registration.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-120

Affected software

No affected versions have been published.

Timeline

Published
Sep 8, 2021
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-40818: Critical severity, CVSS 9.8 | Vulnix