What is CVE-2022-27240?

CVE-2022-27240 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 2022-03-18.

How severe is CVE-2022-27240?

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

Buffer overflow in Glewlwyd Sso Server Project

CVE-2022-27240

scheme/webauthn.c in Glewlwyd SSO server 2.x before 2.6.2 has a buffer overflow associated with a webauthn assertion.

Vulnerability class: Buffer Overflow

Published 2022-03-18 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.016 (74.2th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Glewlwyd Sso Server Project

Weakness classification (CWE)

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

References

github.com/babelouest/glewlwyd/commit/4c5597c155bfbaf6491cf6b83479d241ae66940a (Patch, Third Party Advisory)
github.com/babelouest/glewlwyd/releases/tag/v2.6.2 (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2022-27240?: CVE-2022-27240 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 2022-03-18.
How severe is CVE-2022-27240?: Critical severity. CVSS v3 base score is 9.8 out of 10.