Is CVE-2022-21721 in the CISA KEV catalog?

No. CVE-2022-21721 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-21721?

CVE-2022-21721 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2022-21721?

CVE-2022-21721 has an EPSS score of 2.15% (80th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-21721?

Upgrade next.js to 12.0.9 or later.

CVE & CISA-KEV Catalog

CVE-2022-21721

MEDIUMEPSS 80th pctl

5.9

CVSS v3

NVD

Description

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, `[email protected]`, 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.

How to fix

Remediation Available

next.jsNVD

Affected:>= 12.0.0, < 12.0.9Fixed in:12.0.9CVE-2022-21721derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

2.15%probability of exploitation in 30 days

80thpercentile

Elevated risk: more likely to be exploited than 80% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.