CVE-2024-3651

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 1.4%, top 31% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

A vulnerability was identified in the kjd/idna library, specifically within the idna.encode() function, affecting version 3.6. The issue arises from the function's handling of crafted input strings, which can lead to quadratic complexity and consequently, a denial of service condition. This vulnerability is triggered by a crafted input that causes the idna.encode() function to process the input with considerable computational load, significantly increasing the processing time in a quadratic manner relative to the input size.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
69.3%
KEV
Not listed

Published

July 7, 2024

Last Modified

November 4, 2025

References (9)

Vendor Advisories for CVE-2024-3651(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(9)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3-idna (2.0-3ubuntu0.1~esm1) @ xenial2026-05-23ubuntu
ubuntupython3-pip-whl (25.0+dfsg-1ubuntu0.2) @ plucky2026-05-23ubuntu
redhatpython-idna-0:2.4-2.el7_92024-10-23redhat
redhatpython-idna-0:2.5-7.el8_102024-07-02redhat
redhatpython-idna-0:2.10-7.el9_4.12024-06-11redhat
redhatpython-idna-0:3.7-1.el9ap2024-06-10redhat
redhatpython-idna-0:2.5-5.el8_8.12024-06-03redhat
redhatpython-idna-0:2.5-5.el8_6.12024-06-03redhat
redhatpython39-devel:3.9-8100020240516111311.d47b87a42024-05-29redhat

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.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
idna0.1 ... v0.2 (54 versions)3.7—

Weakness Classification(1)

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

Additional Vendor Advisories

(9)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 45× 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. 2026-07-23 02:37 UTCEG score recompute
  2. 2026-07-22 14:07 UTCEPSS rescore
  3. 2026-07-21 15:23 UTCEPSS rescore
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  18. 2026-07-13 07:07 UTCOSV refresh
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  1. 2026-07-06 16:26 UTCEPSS rescore
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  16. 2026-06-24 20:01 UTCOSV refresh
  17. 2026-06-24 14:04 UTCEPSS rescore
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  40. 2026-06-10 13:21 UTCEPSS rescore
  41. 2026-06-08 14:16 UTCEPSS rescore
  42. 2026-06-07 20:46 UTCOSV refresh
  43. 2026-06-07 15:24 UTCEPSS rescore
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  45. 2026-06-06 13:46 UTCEPSS rescore
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  69. 2026-05-26 07:18 UTCEPSS rescore
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  71. 2026-05-26 07:18 UTCEPSS rescore
  72. 2026-05-23 10:33 UTCEG score recompute
  73. 2026-05-23 10:33 UTCVendor advisory

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2024-3651?
CVE-2024-3651 is a high vulnerability published on July 7, 2024. A vulnerability was identified in the kjd/idna library, specifically within the idna.encode() function, affecting version 3.6. The issue arises from the function's handling of crafted input strings, which can lead to quadratic complexity and consequently, a denial of service condition. This…
When was CVE-2024-3651 disclosed?
CVE-2024-3651 was first published in the National Vulnerability Database on July 7, 2024, with the most recent update on November 4, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-3651 actively exploited?
CVE-2024-3651 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 69.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-3651?
CVE-2024-3651 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2024-3651?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-3651, 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.

Dependency Blast Radius

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