CVE-2020-36223
A flaw was discovered in OpenLDAP before 2.4.57 leading to a slapd crash in the Values Return Filter control handling, resulting in denial of service (double free and out-of-bounds read).
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.23%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A flaw was discovered in OpenLDAP before 2.4.57 leading to a slapd crash in the Values Return Filter control handling, resulting in denial of service (double free and out-of-bounds read).
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 4.23% probability · 91th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-125, CWE-415
- Affected
- openldap/openldap · debian/debian linux · apple/mac os x · apple/macos
- Source
- cve@mitre.org
EPSS 4.2% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://seclists.org/fulldisclosure/2021/May/64Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/May/65Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/May/70Mailing List, Third Party Advisory
- https://bugs.openldap.org/show_bug.cgi?id=9408Issue Tracking, Vendor Advisory
- https://git.openldap.org/openldap/openldap/-/commit/21981053a1195ae1555e23df4d9ac68d34ede9ddPatch, Vendor Advisory
- https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57Release Notes, Vendor Advisory
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2021/02/msg00005.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210226-0002/Third Party Advisory
- https://support.apple.com/kb/HT212529Third Party Advisory
- https://support.apple.com/kb/HT212530Third Party Advisory
- https://support.apple.com/kb/HT212531Third Party Advisory
- https://www.debian.org/security/2021/dsa-4845Third Party Advisory
- http://seclists.org/fulldisclosure/2021/May/64Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/May/65Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/May/70Mailing List, Third Party Advisory
- https://bugs.openldap.org/show_bug.cgi?id=9408Issue Tracking, Vendor Advisory
- https://git.openldap.org/openldap/openldap/-/commit/21981053a1195ae1555e23df4d9ac68d34ede9ddPatch, Vendor Advisory
- https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57Release Notes, Vendor Advisory
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2021/02/msg00005.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210226-0002/Third Party Advisory
- https://support.apple.com/kb/HT212529Third Party Advisory
- https://support.apple.com/kb/HT212530Third Party Advisory
- https://support.apple.com/kb/HT212531Third Party Advisory
- https://www.debian.org/security/2021/dsa-4845Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.