CVE-2024-37302

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.6%, 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

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

Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insufficient to mitigate this. This can lead to a denial of service, ranging from further media uploads/downloads failing to completely unavailability of the Synapse process, depending on how Synapse was deployed. Synapse 1.106 introduces a new "leaky bucket" rate limit on remote media downloads to reduce the amount of data a user can request at a time. This does not fully address the issue, but does limit an unauthenticated user's ability to request large amounts of data to be cached.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
43.2%
KEV
Not listed

Published

December 3, 2024

Last Modified

August 26, 2025

References (1)

Vendor Advisories for CVE-2024-37302(1)

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

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
matrix-synapse0.33.5 ... 1.99.0rc1 (378 versions)1.106.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× 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. 2026-07-11 08:26 UTCEPSS rescore
  2. 2026-07-11 08:26 UTCEPSS rescore
  3. 2026-07-09 19:09 UTCEPSS rescore
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  18. 2026-06-28 04:55 UTCEPSS rescore
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  20. 2026-06-27 03:07 UTCEPSS rescore
  21. 2026-06-27 03:07 UTCEPSS rescore
  22. 2026-06-25 14:46 UTCOSV refresh
  23. 2026-06-25 13:49 UTCEPSS rescore
  24. 2026-06-24 14:04 UTCEPSS rescore
  25. 2026-06-24 14:04 UTCEPSS rescore
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  1. 2026-06-23 21:32 UTCEPSS rescore
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  3. 2026-06-22 14:25 UTCEPSS rescore
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  5. 2026-06-21 14:55 UTCEPSS rescore
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  7. 2026-06-21 01:58 UTCEPSS rescore
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  9. 2026-06-19 19:25 UTCEPSS rescore
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  11. 2026-06-18 17:52 UTCEPSS rescore
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  20. 2026-06-12 23:11 UTCEPSS rescore
  21. 2026-06-11 13:59 UTCEPSS rescore
  22. 2026-06-10 22:17 UTCEPSS rescore
  23. 2026-06-10 13:21 UTCEPSS rescore
  24. 2026-06-08 14:16 UTCEPSS rescore
  25. 2026-06-08 05:28 UTCOSV refresh
  26. 2026-06-07 15:24 UTCEPSS rescore
  27. 2026-06-07 15:24 UTCEPSS rescore
  28. 2026-06-06 13:46 UTCEPSS rescore
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  30. 2026-06-05 22:46 UTCEPSS rescore
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  32. 2026-06-05 06:09 UTCEPSS rescore
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  37. 2026-06-01 13:51 UTCEPSS rescore
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  39. 2026-05-31 22:30 UTCEPSS rescore
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  41. 2026-05-31 00:15 UTCEPSS rescore
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  43. 2026-05-29 13:43 UTCEPSS rescore
  44. 2026-05-28 13:44 UTCEPSS rescore
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  47. 2026-05-27 13:40 UTCEPSS rescore
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  50. 2026-05-26 13:43 UTCEPSS rescore
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  52. 2026-05-26 07:18 UTCEPSS rescore
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  54. 2026-05-26 07:18 UTCEPSS rescore
  55. 2026-05-23 17:04 UTCEG score recompute

Frequently asked(5)

What is CVE-2024-37302?
CVE-2024-37302 is a high vulnerability published on December 3, 2024. Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insufficient to mitigate this. This can lead…
When was CVE-2024-37302 disclosed?
CVE-2024-37302 was first published in the National Vulnerability Database on December 3, 2024, with the most recent update on August 26, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-37302 actively exploited?
CVE-2024-37302 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 43.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-37302?
CVE-2024-37302 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2024-37302?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-37302, 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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