CVE-2021-22945

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 7%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

When sending data to an MQTT server, libcurl <= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation7% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
93.2%
KEV
Not listed

Published

September 23, 2021

Last Modified

June 9, 2025

Advisory Details (8)

Auto-updated Jul 18, 2026
No patch confirmed yet.
generic

[SECURITY] [DSA 5197-1] curl security update

https://www.debian.org/security/2022/dsa-5197
generic

About the security content of macOS Monterey 12.3 - Apple Support

https://support.apple.com/kb/HT213183
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20211029-0003/
generic

curl: Multiple Vulnerabilities (GLSA 202212-01) — Gentoo security

https://security.gentoo.org/glsa/202212-01
generic

[SECURITY] Fedora 33 Update: curl-7.71.1-11.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/
generic

[SECURITY] Fedora 35 Update: curl-7.79.1-1.fc35 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/
generic

HackerOne

https://hackerone.com/reports/1269242
generic

Full Disclosure: APPLE-SA-2022-03-14-4 macOS Monterey 12.3

http://seclists.org/fulldisclosure/2022/Mar/29

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntucurl (7.74.0-1ubuntu2.3) @ hirsute2026-05-26ubuntu

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

(2)

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 12× in last 7d / 49× 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 104 total refreshes for this CVE.

  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 01:57 UTCEG score recompute
  3. 2026-07-22 22:44 UTCEG score recompute
  4. 2026-07-22 14:05 UTCEPSS rescore
  5. 2026-07-21 15:22 UTCEPSS rescore
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  10. 2026-07-18 11:29 UTCOSV refresh
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  1. 2026-07-06 16:25 UTCEPSS rescore
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  8. 2026-07-02 16:57 UTCEPSS rescore
  9. 2026-07-01 15:03 UTCEPSS rescore
  10. 2026-06-30 23:20 UTCEPSS rescore
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  12. 2026-06-30 13:00 UTCOSV refresh
  13. 2026-06-29 14:04 UTCEPSS rescore
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  27. 2026-06-21 14:54 UTCEPSS rescore
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  40. 2026-06-12 23:10 UTCEPSS rescore
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  42. 2026-06-12 21:10 UTCOSV refresh
  43. 2026-06-11 13:58 UTCEPSS rescore
  44. 2026-06-10 22:16 UTCEPSS rescore
  45. 2026-06-10 22:16 UTCEPSS rescore
  46. 2026-06-10 13:20 UTCEPSS rescore
  47. 2026-06-08 14:15 UTCEPSS rescore
  48. 2026-06-08 14:15 UTCEPSS rescore
  49. 2026-06-07 15:23 UTCEPSS rescore
  50. 2026-06-07 15:23 UTCEPSS rescore
  51. 2026-06-06 13:46 UTCEPSS rescore
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  54. 2026-06-05 22:45 UTCEPSS rescore
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  73. 2026-05-26 13:42 UTCEPSS rescore
  74. 2026-05-26 10:00 UTCEG score recompute
  75. 2026-05-26 10:00 UTCVendor advisory

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Frequently asked(5)

What is CVE-2021-22945?
CVE-2021-22945 is a critical vulnerability published on September 23, 2021. When sending data to an MQTT server, libcurl <= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it again.
When was CVE-2021-22945 disclosed?
CVE-2021-22945 was first published in the National Vulnerability Database on September 23, 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-2021-22945 actively exploited?
CVE-2021-22945 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-22945?
CVE-2021-22945 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2021-22945?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-22945, 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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