# CVE-2024-28820: openvpn-auth-ldap: Buffer overflow in the extract_openvpn_cr function in openvpn-cr.c in openvpn-auth-ldap (aka the Three Rings Auth-LDA...

CVE-2024-28820 is fixed in openvpn-auth-ldap on 1 platform, first by DEBIAN-CVE-2024-28820, released June 27, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-28820
- Priority: Routine
- CVSS: 6.3 (medium)
- EPSS: 0.0042
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 27, 2024

## Description

Buffer overflow in the extract_openvpn_cr function in openvpn-cr.c in openvpn-auth-ldap (aka the Three Rings Auth-LDAP plugin for OpenVPN) 2.0.4 allows attackers with a valid LDAP username and who can control the challenge/response password field to pass a string with more than 14 colons into this field and cause a buffer overflow.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | openvpn-auth-ldap Debian 13.5 (trixie) | 2.0.4-4 | [DEBIAN-CVE-2024-28820](https://patchblox.com/security/data/fix/linux/debian-cve-2024-28820.md) | Jun 27, 2024 |
| Linux | openvpn-auth-ldap Debian 14 | 2.0.4-4 | [DEBIAN-CVE-2024-28820](https://patchblox.com/security/data/fix/linux/debian-cve-2024-28820.md) | Jun 27, 2024 |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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