CVE-2021-43803
Unexpected server crash in Next.js.
7.5
HIGH
CVSS 3.1
EPSS 2.1%
Description
Next.js is a React framework. In versions of Next.js prior to 12.0.5 or 11.1.3, invalid or malformed URLs could lead to a server crash. In order to be affected by this issue, the deployment must use Next.js versions above 11.1.0 and below 12.0.5, Node.js above 15.0.0, and next start or a custom server. Deployments on Vercel are not affected, along with similar environments where invalid requests are filtered before reaching Next.js. Versions 12.0.5 and 11.1.3 contain patches for this issue.
How to fix CVE-2021-43803
To remediate CVE-2021-43803, upgrade the affected package to a fixed version below.
- —upgrade to 0 or later
- —upgrade to 12.0.5 or later
Is CVE-2021-43803 being exploited?
Low — EPSS is 2.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 0
- >= 12.0.0, < 12.0.5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |