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CVE-2020-36228

65
FAUCET Score

CVE-2020-36228 is an integer underflow vulnerability in OpenLDAP versions prior to 2.4.57, affecting various Apple and Debian products utilizing OpenLDAP. This flaw can lead to a denial-of-service condition due to a slapd crash during Certificate List Exact Assertion processing. With a CVSS score of 7.5 (High), it can be exploited remotely with low attack complexity, requiring no user interaction, and resulting in high availability impact. While its EPSS score is notably high, indicating a significant likelihood of exploitation, there is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.4.57CPE matchmatch criteria
cpe:2.3:a:openldap:openldap:*:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
>= 11.1, < 11.4CPE matchmatch criteria
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
83.38%
Probability of exploitation in next 30 days
EPSS Percentile
99.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.8338 is in the 100th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

mediatekpatch availablevia llm_extracted
Fixed in: 9.3.1, 9.2.3, 9.1.6
microsoftpatch availablevia msrc
Product: 16831-16820Fixed in: 2.4.57-2
microsoftpatch availablevia msrc
Product: cm1 openldap 2.4.57-2 on CBL Mariner 1.0Fixed in: 2.4.57-2

Vendor Advisories (3)

mediatekllm-mediatek-5bd731d14163992dHIGH

Third-Party Package Updates in Splunk Enterprise - October 2024

Oct 14, 2024
redhatCVE-2020-36228Moderate

openldap: Integer underflow in issuerAndThisUpdateCheck in schema_init.c

Jan 26, 2021
microsoft2021-Jan/CVE-2020-36228Important

An integer underflow was discovered in OpenLDAP before 2.4.57 leading to a slapd crash in the Certificate List Exact Assertion processing resulting in denial of service.

Jan 12, 2021

References

bugs.openldap.org / show_bug.cgi
Issue TrackingVendor Advisory
seclists.org / fulldisclosure/2021/May/64
Mailing ListThird Party Advisory
seclists.org / fulldisclosure/2021/May/65
Mailing ListThird Party Advisory
seclists.org / fulldisclosure/2021/May/70
Mailing ListThird Party Advisory
git.openldap.org / openldap/openldap/-/commit/91dccd25c347733b365adc74cb07d074512ed5ad
PatchVendor Advisory
git.openldap.org / openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57
Release NotesVendor Advisory
lists.apache.org / thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
lists.apache.org / thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
lists.debian.org / debian-lts-announce/2021/02/msg00005.html
Mailing ListThird Party Advisory
security.netapp.com / advisory/ntap-20210226-0002
Third Party Advisory
support.apple.com / kb/HT212529
Third Party Advisory
support.apple.com / kb/HT212530
Third Party Advisory
support.apple.com / kb/HT212531
Third Party Advisory
debian.org / security/2021/dsa-4845
Third Party Advisory