OpenLDAP up to 2.4.56 slapd schema_init.c serialNumberAndIssuerCheck integer underflow

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in OpenLDAP up to 2.4.56. This impacts the function serialNumberAndIssuerCheck of the file schema_init.c of the component slapd. Such manipulation leads to integer underflow. This vulnerability is documented as CVE-2020-36221. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in OpenLDAP up to 2.4.56 (Directory Service Software). Affected by this issue is the function serialNumberAndIssuerCheck of the file schema_init.c of the component slapd. The manipulation with an unknown input leads to a integer underflow vulnerability. Using CWE to declare the problem leads to CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. Impacted is availability.

The weakness was released 01/27/2021. This vulnerability is handled as CVE-2020-36221. There are known technical details, but no exploit is available.

Upgrading to version 2.4.57 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2023-1127). Once again VulDB remains the best source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Ubuntu Linux
  • SUSE Linux
  • Open Source OpenLDAP
  • Hitachi Energy RTU500
  • Splunk Splunk Enterprise

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Integer underflow
CWE: CWE-191 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: OpenLDAP 2.4.57

Timelineinfo

01/25/2021 🔍
01/27/2021 +2 days 🔍
01/27/2021 +0 days 🔍
08/25/2025 +1671 days 🔍

Sourcesinfo

Status: Confirmed

CVE: CVE-2020-36221 (🔍)
GCVE (CVE): GCVE-0-2020-36221
GCVE (VulDB): GCVE-100-168716
CERT Bund: WID-SEC-2023-1127 - OpenLDAP: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 01/27/2021 09:52
Updated: 08/25/2025 11:36
Changes: 01/27/2021 09:52 (27), 01/27/2021 09:53 (14), 02/20/2021 07:14 (2), 02/20/2021 07:17 (18), 08/25/2025 11:36 (22)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

Discussion

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