Vulnerability · Published Sep 8, 2021 · Assigned by mitre
CVE-2021-40818
Critical 9.8
In plain English
A critical-severity security flaw in the glewlwyd package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 74% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)1.5%top 25.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
scheme/webauthn.c in Glewlwyd SSO server through 2.5.3 has a buffer overflow during FIDO2 signature validation in webauthn registration.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | glewlwyd | 2.5.2-3 | DEBIAN-CVE-2021-40818 |
| Debian:13 | glewlwyd | 2.5.2-3 | DEBIAN-CVE-2021-40818 |
| Ubuntu:22.04:LTS | glewlwyd | no fix listed | UBUNTU-CVE-2021-40818 |
Affected products (as reported)
References
- https://github.com/babelouest/glewlwyd/commit/0efd112bb62f566877750ad62ee828bff579b4e2 x_refsource_MISC
- https://bugs.debian.org/993867 x_refsource_MISC