Vulnerability in Vercel Next.js
CVE-2022-21721
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.022 (81.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000
Affected products
Public proof-of-concept exploits
References
- github.com/vercel/next.js/security/advisories/GHSA-wr66-vrwm-5g5x (Third Party Advisory)
- github.com/vercel/next.js/pull/33503 (Patch, Third Party Advisory)
- github.com/vercel/next.js/releases/tag/v12.0.9 (Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2022-21721?
- CVE-2022-21721 is a medium-severity vulnerability in Vercel Next.js. CVSS score: 5.9/10. Published 2022-01-28.
- How severe is CVE-2022-21721?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2022-21721 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.