# CVE-2021-35473: lemonldap-ng: An issue was discovered in LemonLDAP::NG before 2.0.12

CVE-2021-35473 is fixed in lemonldap-ng on 1 platform, first by DEBIAN-CVE-2021-35473, released November 10, 2024. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2021-35473
- Priority: Urgent
- CVSS: 9.1 (critical)
- EPSS: 0.0041
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 10, 2024

## Description

An issue was discovered in LemonLDAP::NG before 2.0.12. There is a missing expiration check in the OAuth2.0 handler, i.e., it does not verify access token validity. An attacker can use a expired access token from an OIDC client to access the OAuth2 handler The earliest affected version is 2.0.4.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | lemonldap-ng Debian 12.15 (bookworm) | 2.0.11+ds-4 | [DEBIAN-CVE-2021-35473](https://patchblox.com/security/data/fix/linux/debian-cve-2021-35473.md) | Nov 10, 2024 |
| Linux | lemonldap-ng Debian 13.5 (trixie) | 2.0.11+ds-4 | [DEBIAN-CVE-2021-35473](https://patchblox.com/security/data/fix/linux/debian-cve-2021-35473.md) | Nov 10, 2024 |
| Linux | lemonldap-ng Debian 14 | 2.0.11+ds-4 | [DEBIAN-CVE-2021-35473](https://patchblox.com/security/data/fix/linux/debian-cve-2021-35473.md) | Nov 10, 2024 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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