What’s Vulnerable › Vulnerabilities

CVE-2020-12243

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-04-28 · updated 2026-10-14
• Weakness: CWE-674

Description

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).

Affected products

• macOS: from 10.13.0 before 10.13.6; from 10.14.0 before 10.14.6; from 10.15 before 10.15.6; 10.13.6-security_update_2018-002, 10.13.6-security_update_2018-003, 10.13.6-security_update_2019-001, 10.13.6-security_update_2019-002, 10.13.6-security_update_2019-003, 10.13.6-security_update_2019-004 (+25) — fixed in 10.13.6, 10.14.6, 10.15.6
• Broadcom Brocade Fabric Operating System: all versions
• Canonical Ubuntu Linux: 12.04, 14.04, 16.04, 18.04, 19.10, 20.04
• Debian Linux: 8.0, 9.0, 10.0
• NetApp Cloud Backup: all versions
• NetApp H300E Firmware: all versions
• NetApp H300S Firmware: all versions
• NetApp H410C Firmware: all versions
• NetApp H410S Firmware: all versions
• NetApp H500E Firmware: all versions
• NetApp H500S Firmware: all versions
• NetApp H700E Firmware: all versions
• NetApp H700S Firmware: all versions
• NetApp Steelstore Cloud Integrated Storage: all versions
• openldap: before 2.4.50 — fixed in 2.4.50
• openSUSE Leap: 15.1
• Oracle Corporation Solaris Operating System: 10, 11
• Oracle Corporation Oracle ZFS Storage Appliance Kit: 8.8

How to fix

Upgrade to a fixed version: macOS 10.13.6, 10.14.6, 10.15.6; openldap 2.4.50. Check the vendor advisory for mitigations.

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
• https://security.netapp.com/advisory/ntap-20200511-0003/
• https://support.apple.com/kb/HT211289
• https://usn.ubuntu.com/4352-1/
• https://usn.ubuntu.com/4352-2/
• https://www.debian.org/security/2020/dsa-4666
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://www.oracle.com/security-alerts/cpuoct2020.html

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