CVE-2022-21721

DOS Vulnerability in next.js

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, `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.

5.9

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 1.47% Top 25%

Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com

Affected: n/a n/a

References

Link	Tags
https://github.com/vercel/next.js/security/advisories/GHSA-wr66-vrwm-5g5x	third party advisory
https://github.com/vercel/next.js/pull/33503	third party advisory patch
https://github.com/vercel/next.js/releases/tag/v12.0.9	third party advisory release notes

Frequently Asked Questions

What is the severity of CVE-2022-21721?: CVE-2022-21721 has been scored as a medium severity vulnerability.
How to fix CVE-2022-21721?: To fix CVE-2022-21721, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-21721 being actively exploited in the wild?: It is possible that CVE-2022-21721 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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