CVE-2021-22924

LOWNVD 3.73.7—
EchelonGraph scoreMEDIUM confidence

Score 3.7 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 3.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
3.7
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 6%CVSS: 3.7Exploit: NoneExposed: 0

A fix is available — apply it.

libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take 'issuercert' into account and it compared the involved paths *case insensitively*,which could lead to libcurl reusing wrong connections.File paths are, or can be, case sensitive on many systems but not all, and caneven vary depending on used file systems.The comparison also didn't include the 'issuer cert' which a transfer can setto qualify how to verify the server certificate.

CVSS v3
3.7
EG Score
3.7(medium)
EPSS
92.8%
KEV
Not listed

Published

August 5, 2021

Last Modified

June 9, 2025

References (30)

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntucurl (7.74.0-1ubuntu2.1) @ hirsute2026-05-26ubuntu
redhatrh-dotnet31-curl-0:7.61.1-22.el7_92022-04-13redhat
redhatcurl-0:7.61.1-18.el8_4.12021-09-21redhat

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(2)

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

All Vendor Advisories

(4)

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 11× in last 7d / 47× 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. 2026-07-21 15:22 UTCEPSS rescore
  2. 2026-07-21 15:22 UTCEPSS rescore
  3. 2026-07-20 17:04 UTCEPSS rescore
  4. 2026-07-19 14:28 UTCEPSS rescore
  5. 2026-07-19 02:26 UTCEPSS rescore
  6. 2026-07-18 14:59 UTCOSV refresh
  7. 2026-07-18 10:02 UTCEPSS rescore
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  20. 2026-07-08 15:12 UTCEPSS rescore
  21. 2026-07-07 13:43 UTCEPSS rescore
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  1. 2026-07-05 02:28 UTCEPSS rescore
  2. 2026-07-04 06:29 UTCEPSS rescore
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  4. 2026-07-02 16:57 UTCEPSS rescore
  5. 2026-07-01 15:03 UTCEPSS rescore
  6. 2026-06-30 23:20 UTCEPSS rescore
  7. 2026-06-30 23:20 UTCEPSS rescore
  8. 2026-06-30 20:30 UTCOSV refresh
  9. 2026-06-29 14:04 UTCEPSS rescore
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  11. 2026-06-28 04:54 UTCEPSS rescore
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  17. 2026-06-24 14:03 UTCEPSS rescore
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  19. 2026-06-23 21:31 UTCEPSS rescore
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  21. 2026-06-22 14:24 UTCEPSS rescore
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  23. 2026-06-21 14:54 UTCEPSS rescore
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  25. 2026-06-21 01:58 UTCEPSS rescore
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  27. 2026-06-19 19:24 UTCEPSS rescore
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  29. 2026-06-18 17:51 UTCEPSS rescore
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  31. 2026-06-17 17:51 UTCEPSS rescore
  32. 2026-06-16 17:50 UTCEPSS rescore
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  34. 2026-06-14 23:15 UTCEPSS rescore
  35. 2026-06-13 22:58 UTCEPSS rescore
  36. 2026-06-13 00:44 UTCOSV refresh
  37. 2026-06-12 23:10 UTCEPSS rescore
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  39. 2026-06-11 13:58 UTCEPSS rescore
  40. 2026-06-10 22:16 UTCEPSS rescore
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  42. 2026-06-10 13:20 UTCEPSS rescore
  43. 2026-06-08 14:15 UTCEPSS rescore
  44. 2026-06-08 14:15 UTCEPSS rescore
  45. 2026-06-07 15:23 UTCEPSS rescore
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  47. 2026-06-06 13:46 UTCEPSS rescore
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  50. 2026-06-05 22:45 UTCEPSS rescore
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  52. 2026-06-05 06:09 UTCEPSS rescore
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  55. 2026-06-04 13:10 UTCEPSS rescore
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  58. 2026-06-01 13:50 UTCEPSS rescore
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  60. 2026-05-31 22:29 UTCEPSS rescore
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  64. 2026-05-29 13:42 UTCEPSS rescore
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  67. 2026-05-27 13:39 UTCEPSS rescore
  68. 2026-05-26 13:42 UTCEPSS rescore
  69. 2026-05-26 13:42 UTCEPSS rescore
  70. 2026-05-26 12:33 UTCEG score recompute
  71. 2026-05-26 12:33 UTCVendor advisory
  72. 2026-05-26 12:33 UTCGHSA enrichment
  73. 2026-05-26 07:17 UTCEPSS rescore
  74. 2026-05-26 07:17 UTCEPSS rescore
  75. 2026-05-25 07:07 UTCOSV refresh

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-22924?
CVE-2021-22924 is a low vulnerability published on August 5, 2021. libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take 'issuercert' into account and it compared the involved paths case insensitively,which could lead to…
When was CVE-2021-22924 disclosed?
CVE-2021-22924 was first published in the National Vulnerability Database on August 5, 2021, with the most recent update on June 9, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-22924 actively exploited?
CVE-2021-22924 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-22924?
CVE-2021-22924 has a CVSS v3 base score of 3.7 (NVD).
How do I remediate CVE-2021-22924?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-22924, 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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