CVE-2020-36221

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
7.5
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 84%
CISA-KEV: Not listedEPSS: 84%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

An integer underflow was discovered in OpenLDAP before 2.4.57 leading to slapd crashes in the Certificate Exact Assertion processing, resulting in denial of service (schema_init.c serialNumberAndIssuerCheck).

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
99.7%
KEV
Not listed

Published

January 26, 2021

Last Modified

November 21, 2024

References (32)

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuslapd-smbk5pwd (2.4.31-1+nmu2ubuntu8.5+esm7) @ trusty2026-05-26ubuntu
ubuntuslapi-dev (2.4.49+dfsg-2ubuntu1.6) @ focal2026-05-26ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:39 UTCEG score recompute
  2. 2026-07-22 14:05 UTCEPSS rescore
  3. 2026-07-20 17:04 UTCEPSS rescore
  4. 2026-07-20 17:04 UTCEPSS rescore
  5. 2026-07-19 03:22 UTCOSV refresh
  6. 2026-07-15 16:55 UTCEPSS rescore
  7. 2026-07-15 16:55 UTCEPSS rescore
  8. 2026-07-13 06:10 UTCEPSS rescore
  9. 2026-07-13 06:10 UTCEPSS rescore
  10. 2026-07-12 05:44 UTCEPSS rescore
  11. 2026-07-11 08:25 UTCEPSS rescore
  12. 2026-07-11 08:25 UTCEPSS rescore
  13. 2026-07-04 06:29 UTCEPSS rescore
  14. 2026-07-04 06:29 UTCEPSS rescore
  15. 2026-07-01 10:18 UTCOSV refresh
  16. 2026-06-27 03:06 UTCEPSS rescore
  17. 2026-06-27 03:06 UTCEPSS rescore
  18. 2026-06-24 14:03 UTCEPSS rescore
  19. 2026-06-24 14:03 UTCEPSS rescore
  20. 2026-06-23 21:31 UTCEPSS rescore
  21. 2026-06-23 21:31 UTCEPSS rescore
  22. 2026-06-17 17:50 UTCEPSS rescore
  23. 2026-06-15 17:46 UTCEPSS rescore
  24. 2026-06-14 23:15 UTCEPSS rescore
  25. 2026-06-13 22:58 UTCEPSS rescore
Show 29 more
  1. 2026-06-13 15:43 UTCOSV refresh
  2. 2026-06-12 23:10 UTCEPSS rescore
  3. 2026-06-11 13:58 UTCEPSS rescore
  4. 2026-06-10 22:16 UTCEPSS rescore
  5. 2026-06-10 13:20 UTCEPSS rescore
  6. 2026-06-07 15:23 UTCEPSS rescore
  7. 2026-06-07 15:23 UTCEPSS rescore
  8. 2026-06-07 15:23 UTCEPSS rescore
  9. 2026-06-06 13:46 UTCEPSS rescore
  10. 2026-06-06 13:45 UTCEPSS rescore
  11. 2026-06-05 22:45 UTCEPSS rescore
  12. 2026-06-05 22:45 UTCEPSS rescore
  13. 2026-06-05 06:08 UTCEPSS rescore
  14. 2026-06-05 06:08 UTCEPSS rescore
  15. 2026-06-04 13:10 UTCEPSS rescore
  16. 2026-06-04 13:10 UTCEPSS rescore
  17. 2026-06-02 20:11 UTCEPSS rescore
  18. 2026-06-02 20:11 UTCEPSS rescore
  19. 2026-06-01 13:50 UTCEPSS rescore
  20. 2026-05-31 22:29 UTCEPSS rescore
  21. 2026-05-31 22:29 UTCEPSS rescore
  22. 2026-05-29 13:42 UTCEPSS rescore
  23. 2026-05-28 13:43 UTCEPSS rescore
  24. 2026-05-28 13:43 UTCEPSS rescore
  25. 2026-05-27 13:39 UTCEPSS rescore
  26. 2026-05-27 13:39 UTCEPSS rescore
  27. 2026-05-26 21:39 UTCEG score recompute
  28. 2026-05-26 21:39 UTCVendor advisory
  29. 2026-05-26 21:39 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2020-36221?
CVE-2020-36221 is a high vulnerability published on January 26, 2021. An integer underflow was discovered in OpenLDAP before 2.4.57 leading to slapd crashes in the Certificate Exact Assertion processing, resulting in denial of service (schema_init.c serialNumberAndIssuerCheck).
When was CVE-2020-36221 disclosed?
CVE-2020-36221 was first published in the National Vulnerability Database on January 26, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-36221 actively exploited?
CVE-2020-36221 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-36221?
CVE-2020-36221 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2020-36221?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-36221, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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