CVE-2021-40874: Debian Linux

Critical severity, CVSS 9.8. EPSS: 1.2% chance of exploitation in the next 30 days.

An issue was discovered in LemonLDAP::NG (aka lemonldap-ng) 2.0.13. When using the RESTServer plug-in to operate a REST password validation service (for another LemonLDAP::NG instance, for example) and using the Kerberos authentication method combined with another method with the Combination authentication plug-in, any password will be recognized as valid for an existing user.

Affected products

• Debian Debian Linux: version 10.0 only
• Lemonldap-NG Lemonldap::ng: version 2.0.13 only

Published 2022-07-18. Last modified 2026-06-17.