CVE-2021-22946

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
Elevated
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 4%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (--ssl-reqd on the command line orCURLOPT_USE_SSL set to CURLUSESSL_CONTROL or CURLUSESSL_ALL withlibcurl). This requirement could be bypassed if the server would return a properly crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations withoutTLS contrary to the instructions and expectations, exposing possibly sensitive data in clear text over the network.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
90.0%
KEV
Not listed

Published

September 29, 2021

Last Modified

April 16, 2026

References (32)

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibcurl4-openssl-dev (7.35.0-1ubuntu2.20+esm8) @ trusty2026-05-22ubuntu
ubuntucurl (7.74.0-1ubuntu2.3) @ hirsute2026-05-22ubuntu
redhatrh-dotnet31-curl-0:7.61.1-22.el7_92022-04-13redhat
redhatcurl-0:7.61.1-12.el8_2.42022-02-22redhat
redhatcurl-0:7.61.1-18.el8_4.22021-11-02redhat

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

(6)

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 8× in last 7d / 43× 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.

Showing the most recent 100 of 141 total refreshes for this CVE.

  1. 2026-07-22 14:05 UTCEPSS rescore
  2. 2026-07-21 15:22 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
  4. 2026-07-20 17:04 UTCEPSS rescore
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  14. 2026-07-12 05:44 UTCEPSS rescore
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  16. 2026-07-11 13:11 UTCOSV refresh
  17. 2026-07-11 08:25 UTCEPSS rescore
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  1. 2026-07-04 06:29 UTCEPSS rescore
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  17. 2026-06-23 21:31 UTCEPSS rescore
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  19. 2026-06-22 19:35 UTCOSV refresh
  20. 2026-06-22 14:24 UTCEPSS rescore
  21. 2026-06-22 14:23 UTCEPSS rescore
  22. 2026-06-21 14:54 UTCEPSS rescore
  23. 2026-06-21 14:54 UTCEPSS rescore
  24. 2026-06-21 01:58 UTCEPSS rescore
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  26. 2026-06-19 19:24 UTCEPSS rescore
  27. 2026-06-19 19:24 UTCEPSS rescore
  28. 2026-06-18 17:51 UTCEPSS rescore
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  30. 2026-06-17 17:51 UTCEPSS rescore
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  35. 2026-06-12 23:10 UTCEPSS rescore
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  37. 2026-06-11 13:58 UTCEPSS rescore
  38. 2026-06-10 22:16 UTCEPSS rescore
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  40. 2026-06-10 13:20 UTCEPSS rescore
  41. 2026-06-08 14:15 UTCEPSS rescore
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  43. 2026-06-07 15:23 UTCEPSS rescore
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  45. 2026-06-06 13:46 UTCEPSS rescore
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  48. 2026-06-05 22:45 UTCEPSS rescore
  49. 2026-06-05 22:45 UTCEPSS rescore
  50. 2026-06-05 10:00 UTCOSV refresh
  51. 2026-06-05 06:09 UTCEPSS rescore
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  53. 2026-06-05 06:08 UTCEPSS rescore
  54. 2026-06-04 13:10 UTCEPSS rescore
  55. 2026-06-02 20:11 UTCEPSS rescore
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  59. 2026-05-31 22:29 UTCEPSS rescore
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  63. 2026-05-29 13:42 UTCEPSS rescore
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  69. 2026-05-26 07:17 UTCEPSS rescore
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  72. 2026-05-22 21:16 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2021-22946?
CVE-2021-22946 is a high vulnerability published on September 29, 2021. A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (--ssl-reqd on the command line orCURLOPTUSESSL set to CURLUSESSLCONTROL or CURLUSESSLALL withlibcurl). This requirement could be bypassed if the server would return a…
When was CVE-2021-22946 disclosed?
CVE-2021-22946 was first published in the National Vulnerability Database on September 29, 2021, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-22946 actively exploited?
CVE-2021-22946 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 90.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-22946?
CVE-2021-22946 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2021-22946?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-22946, 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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