What is CVE-2021-40818?

CVE-2021-40818 is a critical-severity vulnerability in Glewlwyd Sso Server Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-09-08.

How severe is CVE-2021-40818?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Glewlwyd Sso Server Project

CVE-2021-40818

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

Vulnerability class: Buffer Overflow

EPSS: 0.015 (71.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Glewlwyd_sso_server_project Glewlwyd_sso_server
N/a — versions n/a

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Mailing List, Third Party Advisory, x_refsource_MISC, Issue Tracking)

Frequently asked questions

What is CVE-2021-40818?: CVE-2021-40818 is a critical-severity vulnerability in Glewlwyd Sso Server Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-09-08.
How severe is CVE-2021-40818?: Critical severity. CVSS v3 base score is 9.8 out of 10.