CVE-2020-15813 Improper Certificate Validation in Graylog
Attackers can bypass authentication by intercepting traffic to a malicious LDAP server due to missing SSL certificate validation in Graylog.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-15813?
CVE-2020-15813 is a high-severity authentication bypass vulnerability in n/a, published on 17 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Graylog before 3.3.3 lacks SSL Certificate Validation for LDAP servers. It allows use of an external user/group database stored in LDAP. The connection configuration allows the usage of unencrypted, SSL- or TLS-secured connections. Unfortunately, the Graylog client code (in all versions that support LDAP) does not implement proper certificate validation (regardless of whether the "Allow self-signed certificates" option is used). Therefore, any attacker with the ability to intercept network traffic between a Graylog server and an LDAP server is able to redirect traffic to a different LDAP server (unnoticed by the Graylog server due to the lack of certificate validation), effectively bypassing Graylog's authentication mechanism.
Weakness: CWE-295
Which versions are affected by CVE-2020-15813?
2 open source packages ship an affected version, including org.graylog:graylog-parent. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.graylog:graylog-parent Maven | All versions | 3.3.3 |
org.graylog:graylog-parent Maven | All versions | 3.3.3 |
Products include Graylog Graylog.
How do I fix CVE-2020-15813?
Upgrade org.graylog:graylog-parent to 3.3.3 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2020-15813 being exploited?
There is no known exploitation of CVE-2020-15813 in the wild and no public exploit code.
Other vulnerabilities in n/a
- CVE-2021-37759 Information disclosure in n/a
- CVE-2021-37760 Information disclosure in n/a
- CVE-2026-1435 Incorrect management of session invalidation vulnerability in Graylog Web Interface
- CVE-2025-53106 Graylog vulnerable to privilege escalation through API tokens
- CVE-2024-24824 graylog2-server vulnerable to instantiation of arbitrary classes triggered by API request
Sources
Also known as GHSA-3gg9-f3vh-866f.