CVE-2022-21721

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under NVD CVSS v3. EPSS exploit probability: 2.2%, top 20% 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
Trending — 3 sources updated this week
5.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 2%CVSS: 5.9Exploit: NoneExposed: 0

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

Next.js is a React framework. Starting with version 12.0.0 and prior to version 12.0.9, vulnerable code could allow a bad actor to trigger a denial of service attack for anyone using i18n functionality. In order to be affected by this CVE, one must use next start or a custom server and the built-in i18n support. Deployments on Vercel, along with similar environments where invalid requests are filtered before reaching Next.js, are not affected. A patch has been released, next@12.0.9, that mitigates this issue. As a workaround, one may ensure /${locale}/_next/ is blocked from reaching the Next.js instance until it becomes feasible to upgrade.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
—
EPSS
80.2%
KEV
Not listed

Published

January 28, 2022

Last Modified

November 21, 2024

References (6)

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
next—12.0.9—

Data Freshness Timeline

(refreshed 13× in last 7d / 44× 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. 2026-07-22 22:54 UTCEG score recompute
  2. 2026-07-22 14:06 UTCEPSS rescore
  3. 2026-07-22 14:06 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
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  6. 2026-07-20 17:05 UTCEPSS rescore
  7. 2026-07-19 14:29 UTCEPSS rescore
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  9. 2026-07-18 10:02 UTCEPSS rescore
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  11. 2026-07-18 01:29 UTCOSV refresh
  12. 2026-07-16 17:00 UTCEPSS rescore
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  14. 2026-07-15 16:56 UTCEPSS rescore
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  1. 2026-07-06 02:21 UTCEPSS rescore
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  5. 2026-07-01 15:04 UTCEPSS rescore
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  8. 2026-06-29 21:53 UTCOSV refresh
  9. 2026-06-29 14:04 UTCEPSS rescore
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  11. 2026-06-28 14:06 UTCEPSS rescore
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  22. 2026-06-21 01:58 UTCEPSS rescore
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  24. 2026-06-19 19:24 UTCEPSS rescore
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  26. 2026-06-18 17:51 UTCEPSS rescore
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  31. 2026-06-15 17:46 UTCEPSS rescore
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  36. 2026-06-12 23:10 UTCEPSS rescore
  37. 2026-06-12 23:10 UTCEPSS rescore
  38. 2026-06-12 10:40 UTCOSV refresh
  39. 2026-06-11 13:58 UTCEPSS rescore
  40. 2026-06-11 13:58 UTCEPSS rescore
  41. 2026-06-10 22:16 UTCEPSS rescore
  42. 2026-06-10 13:20 UTCEPSS rescore
  43. 2026-06-08 14:15 UTCEPSS rescore
  44. 2026-06-08 14:15 UTCEPSS rescore
  45. 2026-06-07 15:23 UTCEPSS rescore
  46. 2026-06-07 15:23 UTCEPSS rescore
  47. 2026-06-06 13:46 UTCEPSS rescore
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  49. 2026-06-05 22:45 UTCEPSS rescore
  50. 2026-06-05 06:09 UTCEPSS rescore
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  52. 2026-06-04 13:11 UTCEPSS rescore
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  60. 2026-05-31 22:29 UTCEPSS rescore
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  62. 2026-05-31 00:15 UTCEPSS rescore
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  64. 2026-05-29 13:42 UTCEPSS rescore
  65. 2026-05-28 13:43 UTCEPSS rescore
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  68. 2026-05-27 13:39 UTCEPSS rescore
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  70. 2026-05-26 13:43 UTCEPSS rescore
  71. 2026-05-26 07:17 UTCEPSS rescore
  72. 2026-05-26 07:17 UTCEPSS rescore
  73. 2026-05-26 03:55 UTCEG score recompute

Frequently asked(5)

What is CVE-2022-21721?
CVE-2022-21721 is a medium vulnerability published on January 28, 2022. Next.js is a React framework. Starting with version 12.0.0 and prior to version 12.0.9, vulnerable code could allow a bad actor to trigger a denial of service attack for anyone using i18n functionality. In order to be affected by this CVE, one must use next start or a custom server and the built-in…
When was CVE-2022-21721 disclosed?
CVE-2022-21721 was first published in the National Vulnerability Database on January 28, 2022, 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-2022-21721 actively exploited?
CVE-2022-21721 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 80.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2022-21721?
CVE-2022-21721 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2022-21721?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-21721, 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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