CVE-2020-12243

In filter.c in slapd in OpenLDAP before 2.4.50, LDAP search filters with nested boolean expressions can result in denial of service (daemon crash).

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

4.7% chance of exploitation in the next 30 days; higher than 91% of CVEs (scores of 2026-10-25)

CWE

CWE-674

Published

2020-04-28

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• apple:mac_os_x
• broadcom:brocade_fabric_operating_system
• canonical:ubuntu_linux
• debian:debian_linux
• netapp:cloud_backup
• netapp:h300e_firmware
• netapp:h300s_firmware
• netapp:h410c_firmware
• netapp:h410s_firmware
• netapp:h500e_firmware
• netapp:h500s_firmware
• netapp:h700e_firmware
• netapp:h700s_firmware
• netapp:steelstore_cloud_integrated_storage
• openldap:openldap
• opensuse:leap
• oracle:solaris
• oracle:zfs_storage_appliance_kit

References

• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00016.html
• https://bugs.openldap.org/show_bug.cgi?id=9202
• https://git.openldap.org/openldap/openldap/-/blob/OPENLDAP_REL_ENG_2_4/CHANGES
• https://git.openldap.org/openldap/openldap/-/commit/98464c11df8247d6a11b52e294ba5dd4f0380440
• https://lists.debian.org/debian-lts-announce/2020/05/msg00001.html

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