CVE-2020-25710 Denial of service in openldap
An attacker can cause a denial of service in OpenLDAP by sending a malicious packet that triggers a failed assertion.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-25710?
CVE-2020-25710 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 28 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw was found in OpenLDAP in versions before 2.4.56. This flaw allows an attacker who sends a malicious packet processed by OpenLDAP to force a failed assertion in csnNormalize23(). The highest threat from this vulnerability is to system availability.
Weakness: CWE-617
Which versions are affected by CVE-2020-25710?
1 open source package ship an affected version, including openldap. It affects 7 products.
| Package | Affected | Fixed in |
|---|---|---|
openldap Bitnami | All versions | 2.4.56 |
Products include Debian Debian Linux, Fedoraproject Fedora, Openldap Openldap, Redhat Enterprise Linux, Redhat Jboss Core Services, Redhat Jboss Enterprise Application Platform and 1 more.
How do I fix CVE-2020-25710?
Upgrade openldap to 2.4.56 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-25710 being exploited?
There is no known exploitation of CVE-2020-25710 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2020-25710, BIT-openldap-2020-25710, CLEANSTART-2026-FJ95448, DEBIAN-CVE-2020-25710, GHSA-8wg3-gqcw-9fq9, JLSEC-2026-162 and 2 more.