A flaw was discovered in OpenLDAP before 2.4.57 leading to an infinite loop in slapd with…
Priority HIGH 72CWE-835Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-835.
Summary
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.
Why it matters now
EPSS 0.77236 99th percentileScored 2026-11-07
Fix Will not fix Red Hat: no fix planned
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:openldap:openldap:*:*:*:*:*:*:*:* | before 2.4.57 | Vulnerable | openldap |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
| cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* | 11.1 to before 11.4 | Vulnerable | Apple |
- cpe:2.3:a:openldap:openldap:*:*:*:*:*:*:*:* Versions before 2.4.57 Vulnerable ·openldap
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
- cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions 11.1 to before 11.4 Vulnerable ·Apple
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
Not affected: 2 products
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2020-36227
- 2026-10-03 Alias added: GHSA-6w5v-vmwv-xcwj
References
Advisory 11
- https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57
- https://bugs.openldap.org/show_bug.cgi?id=9428
- [debian-lts-announce] 20210203 [SECURITY] [DLA 2544-1] openldap security update
- DSA-4845
- https://security.netapp.com/advisory/ntap-20210226-0002/
- https://support.apple.com/kb/HT212529
- https://support.apple.com/kb/HT212531
- https://support.apple.com/kb/HT212530
- 20210526 APPLE-SA-2021-05-25-2 macOS Big Sur 11.4
- 20210526 APPLE-SA-2021-05-25-4 Security Update 2021-003 Catalina
- 20210526 APPLE-SA-2021-05-25-3 Security Update 2021-004 Mojave
Other 2
- [bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8
- [bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8
Sources
- CVE-2020-36227 · CVE Program
- CVE-2020-36227 · NVD
- FIRST EPSS
- GHSA-6w5v-vmwv-xcwj · GitHub Advisory Database · CC BY 4.0
- CVE-2020-36227 · Red Hat security data · CC BY 4.0
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