CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2021-43803
High (7.5) in vercel next.js. EPSS 47% chance of exploitation in the next 30 days. Fixed in next 11.1.3, 12.0.5.
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.
Severity
- EPSS
- 47% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-31)
- CWE
- CWE-20
- Published
- Modified
- Record from
- the NVD, synced
Affected
- vercel:next.js
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-25mp-g6fv-mqxx | npm | next | >=12.0.0 <12.0.5 | 12.0.5 |
| GHSA-25mp-g6fv-mqxx | npm | next | >=0.9.9 <11.1.3 | 11.1.3 |
References
- https://github.com/vercel/next.js/commit/6d98b4fb4315dec1badecf0e9bdc212a4272b264
- https://github.com/vercel/next.js/pull/32080
- https://github.com/vercel/next.js/releases/tag/v11.1.3
- https://github.com/vercel/next.js/releases/v12.0.5
- https://github.com/vercel/next.js/security/advisories/GHSA-25mp-g6fv-mqxx