CVE catalog

CVE-2021-40818

glewlwyd: CVE-2021-40818

Severity: Medium
Published: Sep 8, 2021, 10:15:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 1.49% · Oct 25, 2026

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

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	glewlwyd	trixie	`2.7.6+ds-3`	fixed
Debian	glewlwyd	bookworm	`2.7.5-3+deb12u1`	fixed
Ubuntu	glewlwyd	18.04	`1.1-2ubuntu1`	vulnerable
Ubuntu	glewlwyd	18.04	`1.2.2-1`	vulnerable
Ubuntu	glewlwyd	18.04	`1.3.1-1`	vulnerable
Ubuntu	glewlwyd	20.04	`1.4.9-2`	vulnerable
Ubuntu	glewlwyd	20.04	`1.4.9-3`	vulnerable
Ubuntu	glewlwyd	22.04	`2.5.2-3`	vulnerable
Ubuntu	glewlwyd	22.04	`2.6.1-1`	vulnerable
Ubuntu	glewlwyd	22.04	`2.6.1-1build1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	glewlwyd	source	trixie	`2.5.2-3`	not yet assigned	Not reported	[993867]
Debian	glewlwyd	source	bookworm	`2.5.2-3`	not yet assigned	Not reported	[993867]

[Debian bug #993867]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[glewlwyd]Fixed
Details (2)
- 2.7.5-3+deb12u1 · amd64 · bookworm
  Fixed · Fixed: 2.5.2-3
  dsa · glewlwyd · debian · bookworm; dsa · glewlwyd · debian · 12
- 2.7.5-3+deb12u1 · arm64 · bookworm
  Fixed · Fixed: 2.5.2-3
  dsa · glewlwyd · debian · bookworm; dsa · glewlwyd · debian · 12
[glewlwyd-common]Fixed
Source package: [glewlwyd]
Details (2)
- 2.7.5-3+deb12u1 · all · bookworm
  Fixed · Fixed: 2.5.2-3
  dsa · glewlwyd · debian · bookworm; dsa · glewlwyd · debian · 12
- 2.7.5-3+deb12u1 · all · bookworm
  Fixed · Fixed: 2.5.2-3
  dsa · glewlwyd · debian · bookworm; dsa · glewlwyd · debian · 12

[Debian 13 (Trixie)]

[glewlwyd]Fixed
Details (2)
- 2.7.6+ds-3 · amd64 · trixie
  Fixed · Fixed: 2.5.2-3
  dsa · glewlwyd · debian · 13
- 2.7.6+ds-3 · arm64 · trixie
  Fixed · Fixed: 2.5.2-3
  dsa · glewlwyd · debian · 13
[glewlwyd-common]Fixed
Source package: [glewlwyd]
Details (2)
- 2.7.6+ds-3 · all · trixie
  Fixed · Fixed: 2.5.2-3
  dsa · glewlwyd · debian · 13
- 2.7.6+ds-3 · all · trixie
  Fixed · Fixed: 2.5.2-3
  dsa · glewlwyd · debian · 13

Observed: Oct 23, 2026, 6:02:32 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]