CVE-2022-2421

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 1.3% (68th percentile of EPSS-scored CVEs). 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
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.3%CVSS: 10.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Due to improper type validation in attachment parsing the Socket.io js library, it is possible to overwrite the _placeholder object which allows an attacker to place references to functions at arbitrary places in the resulting query object.

CVSS v3
10.0
EG Score
10.0CRITICALmedium confidence
EG Risk
61
EG Risk 61/100CISA SSVC

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
Severity100% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.3%
EPSS %ILE
68th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 26, 2022

Last Modified

February 6, 2026

Advisory Details (2)

Auto-updated Oct 10, 2026
Patch available.
generic

Redirecting…

https://csirt.divd.nl/DIVD-2022-00045
generic

Redirecting…

https://csirt.divd.nl/CVE-2022-2421

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
socket.io-parser—
  • 4.0.0 up to 4.0.5: fixed in 4.0.5
  • 4.1.0 up to 4.2.1: fixed in 4.2.1
  • every version up to 3.3.3: fixed in 3.3.3
  • 3.4.0 up to 3.4.2: fixed in 3.4.2
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 28× 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 187 total refreshes for this CVE.

  1. 2026-10-10 19:56 UTCEPSS rescore
  2. 2026-10-09 20:04 UTCEPSS rescore
  3. 2026-10-08 16:40 UTCEPSS rescore
  4. 2026-10-07 23:45 UTCEPSS rescore
  5. 2026-10-06 15:14 UTCEPSS rescore
  6. 2026-10-05 17:40 UTCEPSS rescore
  7. 2026-10-04 23:19 UTCEPSS rescore
  8. 2026-10-03 14:23 UTCEPSS rescore
  9. 2026-10-02 16:23 UTCEPSS rescore
  10. 2026-09-30 15:50 UTCEG score recompute
  11. 2026-09-30 15:00 UTCEPSS rescore
  12. 2026-09-29 15:16 UTCEPSS rescore
  13. 2026-09-28 13:48 UTCEPSS rescore
  14. 2026-09-27 13:42 UTCEPSS rescore
  15. 2026-09-26 15:54 UTCEPSS rescore
  16. 2026-09-26 00:22 UTCEPSS rescore
  17. 2026-09-24 14:00 UTCEPSS rescore
  18. 2026-09-24 07:18 UTCOSV refresh
  19. 2026-09-23 13:45 UTCEPSS rescore
  20. 2026-09-22 14:44 UTCEPSS rescore
  21. 2026-09-19 15:38 UTCEPSS rescore
  22. 2026-09-18 19:24 UTCEPSS rescore
  23. 2026-09-16 14:05 UTCEPSS rescore
  24. 2026-09-15 03:06 UTCEPSS rescore
  25. 2026-09-13 16:44 UTCEPSS rescore
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  1. 2026-09-12 14:57 UTCEPSS rescore
  2. 2026-09-11 14:49 UTCEPSS rescore
  3. 2026-09-11 09:33 UTCEPSS rescore
  4. 2026-09-08 21:57 UTCEPSS rescore
  5. 2026-09-07 15:58 UTCEPSS rescore
  6. 2026-09-06 13:45 UTCEPSS rescore
  7. 2026-09-05 15:25 UTCEPSS rescore
  8. 2026-09-05 00:44 UTCOSV refresh
  9. 2026-09-04 13:57 UTCEPSS rescore
  10. 2026-09-04 13:57 UTCEPSS rescore
  11. 2026-09-04 05:04 UTCEPSS rescore
  12. 2026-09-02 14:09 UTCEPSS rescore
  13. 2026-09-01 13:51 UTCEPSS rescore
  14. 2026-08-30 19:14 UTCEPSS rescore
  15. 2026-08-30 01:19 UTCEPSS rescore
  16. 2026-08-28 21:38 UTCEPSS rescore
  17. 2026-08-27 14:22 UTCEPSS rescore
  18. 2026-08-26 14:43 UTCEPSS rescore
  19. 2026-08-25 13:46 UTCEPSS rescore
  20. 2026-08-24 14:13 UTCEPSS rescore
  21. 2026-08-23 00:16 UTCEPSS rescore
  22. 2026-08-21 23:46 UTCEPSS rescore
  23. 2026-08-20 22:52 UTCEPSS rescore
  24. 2026-08-19 17:01 UTCEPSS rescore
  25. 2026-08-18 13:45 UTCEPSS rescore
  26. 2026-08-18 11:32 UTCOSV refresh
  27. 2026-08-17 13:44 UTCEPSS rescore
  28. 2026-08-16 14:53 UTCEPSS rescore
  29. 2026-08-16 02:11 UTCEPSS rescore
  30. 2026-08-15 01:27 UTCEPSS rescore
  31. 2026-08-13 21:57 UTCEPSS rescore
  32. 2026-08-12 13:48 UTCEPSS rescore
  33. 2026-08-11 13:38 UTCEPSS rescore
  34. 2026-08-09 13:44 UTCEPSS rescore
  35. 2026-08-08 16:34 UTCEPSS rescore
  36. 2026-08-07 16:24 UTCEPSS rescore
  37. 2026-08-06 13:44 UTCEPSS rescore
  38. 2026-08-05 19:15 UTCEPSS rescore
  39. 2026-08-04 15:07 UTCEPSS rescore
  40. 2026-08-04 10:35 UTCEPSS rescore
  41. 2026-08-03 10:33 UTCEPSS rescore
  42. 2026-08-03 07:27 UTCOSV refresh
  43. 2026-08-02 02:24 UTCEPSS rescore
  44. 2026-08-01 04:13 UTCEPSS rescore
  45. 2026-07-30 16:25 UTCEPSS rescore
  46. 2026-07-30 01:28 UTCEPSS rescore
  47. 2026-07-28 15:33 UTCEPSS rescore
  48. 2026-07-25 14:15 UTCEPSS rescore
  49. 2026-07-24 14:15 UTCEPSS rescore
  50. 2026-07-24 14:15 UTCEPSS rescore
  51. 2026-07-23 14:16 UTCEPSS rescore
  52. 2026-07-23 14:16 UTCEPSS rescore
  53. 2026-07-23 02:09 UTCEG score recompute
  54. 2026-07-22 22:55 UTCEG score recompute
  55. 2026-07-22 14:06 UTCEPSS rescore
  56. 2026-07-22 14:06 UTCEPSS rescore
  57. 2026-07-21 15:22 UTCEPSS rescore
  58. 2026-07-21 15:22 UTCEPSS rescore
  59. 2026-07-20 17:05 UTCEPSS rescore
  60. 2026-07-19 14:29 UTCEPSS rescore
  61. 2026-07-19 02:27 UTCEPSS rescore
  62. 2026-07-19 02:27 UTCEPSS rescore
  63. 2026-07-18 10:03 UTCEPSS rescore
  64. 2026-07-18 10:02 UTCEPSS rescore
  65. 2026-07-16 17:00 UTCEPSS rescore
  66. 2026-07-16 16:53 UTCOSV refresh
  67. 2026-07-15 16:56 UTCEPSS rescore
  68. 2026-07-15 16:56 UTCEPSS rescore
  69. 2026-07-15 01:58 UTCEPSS rescore
  70. 2026-07-15 01:58 UTCEPSS rescore
  71. 2026-07-13 22:27 UTCEPSS rescore
  72. 2026-07-13 06:11 UTCEPSS rescore
  73. 2026-07-13 06:11 UTCEPSS rescore
  74. 2026-07-12 05:44 UTCEPSS rescore
  75. 2026-07-12 05:44 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2022-2421?
CVE-2022-2421 is a critical vulnerability published on October 26, 2022. Due to improper type validation in attachment parsing the Socket.io js library, it is possible to overwrite the _placeholder object which allows an attacker to place references to functions at arbitrary places in the resulting query object.
When was CVE-2022-2421 disclosed?
CVE-2022-2421 was first published on October 26, 2022, with the most recent update on February 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-2421 actively exploited?
CVE-2022-2421 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.3% probability of exploitation in the next 30 days (68th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2022-2421?
CVE-2022-2421 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2022-2421?
A fix for CVE-2022-2421 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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