CVE-2020-36227

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2020-36227
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-01-26 18:15:57 UTC
Updated2026-10-14 10:17:37 UTC
DescriptionA flaw was discovered in OpenLDAP before 2.4.57 leading to an infinite loop in slapd with the cancel_extop Cancel operation, resulting in denial of service.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-835 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
2.0[email protected]Primary5AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial

AV:N/AC:L/Au:N/C:N/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Apple Macos All All All All
Operating System Debian Debian Linux 10.0 All All All
Operating System Debian Debian Linux 9.0 All All All
Application Openldap Openldap All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
ITS#9428 fix cancel exop (9d0e8485) · Commits · openldap / OpenLDAP · GitLab af854a3a-2127-422b-91ae-364da2661108 git.openldap.org Patch, Vendor Advisory
About the security content of macOS Big Sur 11.4 - Apple Support af854a3a-2127-422b-91ae-364da2661108 support.apple.com Third Party Advisory
9428 – DoS due to infinite packet processing in slapd af854a3a-2127-422b-91ae-364da2661108 bugs.openldap.org Issue Tracking, Vendor Advisory
lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e69... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Full Disclosure: APPLE-SA-2021-05-25-2 macOS Big Sur 11.4 af854a3a-2127-422b-91ae-364da2661108 seclists.org Mailing List, Third Party Advisory
About the security content of Security Update 2021-004 Mojave - Apple Support af854a3a-2127-422b-91ae-364da2661108 support.apple.com Third Party Advisory
[SECURITY] [DLA 2544-1] openldap security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
About the security content of Security Update 2021-003 Catalina - Apple Support af854a3a-2127-422b-91ae-364da2661108 support.apple.com Third Party Advisory
Debian -- Security Information -- DSA-4845-1 openldap af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
Full Disclosure: APPLE-SA-2021-05-25-3 Security Update 2021-004 Mojave af854a3a-2127-422b-91ae-364da2661108 seclists.org Mailing List, Third Party Advisory
OPENLDAP_REL_ENG_2_4_57 · Tags · openldap / OpenLDAP · GitLab af854a3a-2127-422b-91ae-364da2661108 git.openldap.org Release Notes, Vendor Advisory
Full Disclosure: APPLE-SA-2021-05-25-4 Security Update 2021-003 Catalina af854a3a-2127-422b-91ae-364da2661108 seclists.org Mailing List, Third Party Advisory
lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
February 2021 OpenLDAP Vulnerabilities in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
Pony Mail! MITRE lists.apache.org
Pony Mail! MITRE lists.apache.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 174780 SUSE Enterprise Linux Security update for openldap2 (SUSE-SU-2021:0692-1)
  • 174783 SUSE Enterprise Linux Security update for openldap2 (SUSE-SU-2021:0723-1)
  • 174918 SUSE Enterprise Linux Security Update for openldap2 (SUSE-SU-2021:14700-1)
  • 296069 Oracle Solaris 11.4 Support Repository Update (SRU) 31.88.5 Missing (CPUJAN2021)
  • 354907 Amazon Linux Security Advisory for openldap : ALAS2-2023-2033
  • 354925 Amazon Linux Security Advisory for openldap : ALAS-2023-1741
  • 355082 Amazon Linux Security Advisory for openldap : AL2012-2023-407
  • 375585 Apple macOS Security Update 2021-004 Mojave (HT212531)
  • 375586 Apple macOS Security Update 2021-003 Catalina (HT212530)
  • 375588 Apple MacOS Big Sur 11.4 Not Installed (HT212529)
  • 501459 Alpine Linux Security Update for openldap
  • 504239 Alpine Linux Security Update for openldap
  • 591406 Siemens SIMATIC S7-1500 CPU GNU/Linux subsystem Multiple Vulnerabilities (SSB-439005, ICSA-22-104-13)
  • 670252 EulerOS Security Update for openldap (EulerOS-SA-2021-1824)
  • 670305 EulerOS Security Update for compat-openldap (EulerOS-SA-2021-1771)
  • 670308 EulerOS Security Update for compat-openldap (EulerOS-SA-2021-1916)
  • 670318 EulerOS Security Update for openldap (EulerOS-SA-2021-1906)
  • 670343 EulerOS Security Update for openldap (EulerOS-SA-2021-1881)
  • 670603 EulerOS Security Update for compat-openldap (EulerOS-SA-2021-2361)
  • 670657 EulerOS Security Update for openldap (EulerOS-SA-2021-2415)
  • 730121 McAfee Web Gateway Multiple Vulnerabilities (WP-3484,WP-3744,WP-3745,WP-3746,WP-3747,WP-3793,WP-3800)
  • 750317 OpenSUSE Security Update for openldap2 (openSUSE-SU-2021:0408-1)
  • 900145 CBL-Mariner Linux Security Update for openldap 2.4.50
  • 902825 Common Base Linux Mariner (CBL-Mariner) Security Update for openldap (3827)

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report