CVE-2024-21643

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under NVD CVSS v3. EPSS exploit probability: 2.2%, top 19% 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
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 7.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

IdentityModel Extensions for .NET provide assemblies for web developers that wish to use federated identity providers for establishing the caller's identity. Anyone leveraging the SignedHttpRequestprotocol or the SignedHttpRequestValidatoris vulnerable. Microsoft.IdentityModel trusts the jkuclaim by default for the SignedHttpRequestprotocol. This raises the possibility to make any remote or local HTTP GET request. The vulnerability has been fixed in Microsoft.IdentityModel.Protocols.SignedHttpRequest. Users should update all their Microsoft.IdentityModel versions to 7.1.2 (for 7x) or higher, 6.34.0 (for 6x) or higher.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity71% × 45%
Exploitation2% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
80.8%
KEV
Not listed

Published

January 10, 2024

Last Modified

November 21, 2024

References (8)

Affected Packages

(1 across 1 ecosystem)
NuGet(1)
PackageVulnerable rangeFixed inDependents
Microsoft.IdentityModel.Protocols.SignedHttpRequest7.0.0 ... 7.1.0-preview (10 versions)7.1.2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 51× 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 110 total refreshes for this CVE.

  1. 2026-07-23 14:17 UTCEPSS rescore
  2. 2026-07-23 14:17 UTCEPSS rescore
  3. 2026-07-23 02:33 UTCEG score recompute
  4. 2026-07-22 23:20 UTCEG score recompute
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  45. 2026-06-12 23:11 UTCEPSS rescore
  46. 2026-06-11 13:59 UTCEPSS rescore
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  48. 2026-06-10 22:17 UTCEPSS rescore
  49. 2026-06-10 13:21 UTCEPSS rescore
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  51. 2026-06-09 10:40 UTCOSV refresh
  52. 2026-06-08 14:16 UTCEPSS rescore
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  54. 2026-06-07 15:24 UTCEPSS rescore
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  74. 2026-05-29 13:43 UTCEPSS rescore
  75. 2026-05-29 13:43 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2024-21643?
CVE-2024-21643 is a high vulnerability published on January 10, 2024. IdentityModel Extensions for .NET provide assemblies for web developers that wish to use federated identity providers for establishing the caller's identity. Anyone leveraging the SignedHttpRequestprotocol or the SignedHttpRequestValidatoris vulnerable. Microsoft.IdentityModel trusts the jkuclaim…
When was CVE-2024-21643 disclosed?
CVE-2024-21643 was first published in the National Vulnerability Database on January 10, 2024, 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-2024-21643 actively exploited?
CVE-2024-21643 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 80.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-21643?
CVE-2024-21643 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2024-21643?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-21643, 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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