CVE-2023-22477

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 1.1%, top 39% 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
Elevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.3Exploit: Elevated riskExposed: 0

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

Mercurius is a GraphQL adapter for Fastify. Any users of Mercurius until version 10.5.0 are subjected to a denial of service attack by sending a malformed packet over WebSocket to /graphql. This issue was patched in #940. As a workaround, users can disable subscriptions.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

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
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
62%
KEV
Not listed

Published

January 9, 2023

Last Modified

November 21, 2024

References (6)

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
mercurius—8.13.2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 31× 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 145 total refreshes for this CVE.

  1. 2026-08-25 13:46 UTCEPSS rescore
  2. 2026-08-24 14:14 UTCEPSS rescore
  3. 2026-08-23 00:17 UTCEPSS rescore
  4. 2026-08-21 23:46 UTCEPSS rescore
  5. 2026-08-20 22:53 UTCEPSS rescore
  6. 2026-08-19 17:01 UTCEPSS rescore
  7. 2026-08-18 13:46 UTCEPSS rescore
  8. 2026-08-18 06:04 UTCOSV refresh
  9. 2026-08-17 13:44 UTCEPSS rescore
  10. 2026-08-16 14:53 UTCEPSS rescore
  11. 2026-08-16 02:12 UTCEPSS rescore
  12. 2026-08-15 01:28 UTCEPSS rescore
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  14. 2026-08-13 21:58 UTCEPSS rescore
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  17. 2026-08-08 16:34 UTCEPSS rescore
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  19. 2026-08-06 13:44 UTCEPSS rescore
  20. 2026-08-05 19:15 UTCEPSS rescore
  21. 2026-08-04 15:07 UTCEPSS rescore
  22. 2026-08-04 10:35 UTCEPSS rescore
  23. 2026-08-03 10:34 UTCEPSS rescore
  24. 2026-08-03 01:27 UTCOSV refresh
  25. 2026-08-02 02:24 UTCEPSS rescore
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  1. 2026-08-02 02:24 UTCEPSS rescore
  2. 2026-08-01 04:13 UTCEPSS rescore
  3. 2026-07-30 16:26 UTCEPSS rescore
  4. 2026-07-30 01:28 UTCEPSS rescore
  5. 2026-07-30 01:28 UTCEPSS rescore
  6. 2026-07-28 15:34 UTCEPSS rescore
  7. 2026-07-26 14:52 UTCEPSS rescore
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  9. 2026-07-25 14:16 UTCEPSS rescore
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  11. 2026-07-24 14:15 UTCEPSS rescore
  12. 2026-07-23 14:16 UTCEPSS rescore
  13. 2026-07-23 14:16 UTCEPSS rescore
  14. 2026-07-23 02:18 UTCEG score recompute
  15. 2026-07-22 23:06 UTCEG score recompute
  16. 2026-07-22 14:06 UTCEPSS rescore
  17. 2026-07-21 15:23 UTCEPSS rescore
  18. 2026-07-20 17:05 UTCEPSS rescore
  19. 2026-07-19 14:29 UTCEPSS rescore
  20. 2026-07-19 14:29 UTCEPSS rescore
  21. 2026-07-19 02:27 UTCEPSS rescore
  22. 2026-07-19 02:27 UTCEPSS rescore
  23. 2026-07-18 10:03 UTCEPSS rescore
  24. 2026-07-18 10:03 UTCEPSS rescore
  25. 2026-07-16 17:01 UTCEPSS rescore
  26. 2026-07-16 17:01 UTCEPSS rescore
  27. 2026-07-16 10:19 UTCOSV refresh
  28. 2026-07-15 16:56 UTCEPSS rescore
  29. 2026-07-15 01:58 UTCEPSS rescore
  30. 2026-07-15 01:58 UTCEPSS rescore
  31. 2026-07-13 22:28 UTCEPSS rescore
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  33. 2026-07-13 06:11 UTCEPSS rescore
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  35. 2026-07-12 05:45 UTCEPSS rescore
  36. 2026-07-11 08:25 UTCEPSS rescore
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  38. 2026-07-09 19:08 UTCEPSS rescore
  39. 2026-07-08 15:13 UTCEPSS rescore
  40. 2026-07-07 13:44 UTCEPSS rescore
  41. 2026-07-06 16:26 UTCEPSS rescore
  42. 2026-07-06 16:25 UTCEPSS rescore
  43. 2026-07-06 02:21 UTCEPSS rescore
  44. 2026-07-05 02:28 UTCEPSS rescore
  45. 2026-07-04 06:29 UTCEPSS rescore
  46. 2026-07-04 06:29 UTCEPSS rescore
  47. 2026-07-02 16:58 UTCEPSS rescore
  48. 2026-07-01 15:04 UTCEPSS rescore
  49. 2026-06-30 23:21 UTCEPSS rescore
  50. 2026-06-28 14:06 UTCEPSS rescore
  51. 2026-06-28 14:06 UTCEPSS rescore
  52. 2026-06-28 09:22 UTCOSV refresh
  53. 2026-06-28 04:54 UTCEPSS rescore
  54. 2026-06-28 04:54 UTCEPSS rescore
  55. 2026-06-27 03:07 UTCEPSS rescore
  56. 2026-06-25 13:48 UTCEPSS rescore
  57. 2026-06-25 13:48 UTCEPSS rescore
  58. 2026-06-24 14:03 UTCEPSS rescore
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  60. 2026-06-23 21:31 UTCEPSS rescore
  61. 2026-06-23 21:31 UTCEPSS rescore
  62. 2026-06-22 14:24 UTCEPSS rescore
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  64. 2026-06-21 14:55 UTCEPSS rescore
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  66. 2026-06-21 01:58 UTCEPSS rescore
  67. 2026-06-21 01:58 UTCEPSS rescore
  68. 2026-06-19 19:24 UTCEPSS rescore
  69. 2026-06-19 19:24 UTCEPSS rescore
  70. 2026-06-18 17:51 UTCEPSS rescore
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  72. 2026-06-17 17:51 UTCEPSS rescore
  73. 2026-06-17 17:51 UTCEPSS rescore
  74. 2026-06-16 17:51 UTCEPSS rescore
  75. 2026-06-16 17:51 UTCEPSS rescore

Frequently asked(5)

What is CVE-2023-22477?
CVE-2023-22477 is a medium vulnerability published on January 9, 2023. Mercurius is a GraphQL adapter for Fastify. Any users of Mercurius until version 10.5.0 are subjected to a denial of service attack by sending a malformed packet over WebSocket to /graphql. This issue was patched in #940. As a workaround, users can disable subscriptions.
When was CVE-2023-22477 disclosed?
CVE-2023-22477 was first published in the National Vulnerability Database on January 9, 2023, 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-2023-22477 actively exploited?
CVE-2023-22477 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 38.1% of all scored CVEs.
What is the CVSS score of CVE-2023-22477?
CVE-2023-22477 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2023-22477?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-22477, 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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