CVE-2020-36227: apple macos Infinite Loop
CVSS: 7.5v3.1HighModified
AliasesALPINE-CVE-2020-36227UBUNTU-CVE-2020-36227DEBIAN-CVE-2020-36227
Published 25-01-2021Last modified 14-10-2026
Vulnerability summary
CVE-2020-36227 is a high (CVSS 7.5) Infinite Loop vulnerability in apple macos. EPSS estimates a 77.24% chance of exploitation in the next 30 days, higher than 99.5% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
77.24%
0%100%
Critical · -0.50 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 10 · Related 7Timeline
- 25-01-2021PublishedVulnerability first disclosed.
- 14-10-2026Last modifiedVulnerability information updated.
Description
A 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.
CVSS metrics
5 scores · 4 sources · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 4 agree
- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
77.24%
Chance of exploitation in the next 30 days
Percentile
100%
Versus all other CVEs
30-day change
-0.50 pp
From 77.74% on 19-09-2026
19-09-202619-10-2026
EPSS score77.24%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian2 products
- openldap< 2.4.57+dfsg-1
- debian_linuxEOL9.0 | 10.0
Alpine1 product
- openldap< 2.4.57-r0
Apple1 product
- macos≥ 11.1, < 11.4
Openldap1 product
- openldap< 2.4.57
Ubuntu1 product
- openldap< 2.4.31-1+nmu2ubuntu8.5+esm7 | < 2.4.42+dfsg-2ubuntu3.12 | < 2.4.45+dfsg-1ubuntu1.9 | < 2.4.49+dfsg-2ubuntu1.6
5 vendors · 6 products
References
22 links- git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57X Refsource MISCRelease NotesVendor Advisory
- git.openldap.org/openldap/openldap/-/commit/9d0e8485f3113505743baabf1167e01e4558ccf5X Refsource MISCPatchVendor Advisory
lists.debian.org/debian-lts-announce/2021/02/msg00005.htmlMailing ListX Refsource MLISTThird Party Advisory
