CVE-2021-40818
9.8
CRITICAL
CVSS 3.1
EPSS 0.46%
Description
scheme/webauthn.c in Glewlwyd SSO server through 2.5.3 has a buffer overflow during FIDO2 signature validation in webauthn registration.
How to fix CVE-2021-40818
To remediate CVE-2021-40818, upgrade the affected package to a fixed version below.
- Debian/glewlwyd—upgrade to 2.5.2-2+deb11u1 or later
Is CVE-2021-40818 being exploited?
Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 2.5.2-2+deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |