CVE-2021-43803

moderate-risk
Published 2021-12-10

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.

Do I need to act?

~
2.2% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Vercel

References (10)

Patch https://github.com/vercel/next.js/commit/6d98b4fb4315dec1badecf0e9bdc212a4272b26...
Patch https://github.com/vercel/next.js/pull/32080
Release Notes https://github.com/vercel/next.js/releases/tag/v11.1.3
Release Notes https://github.com/vercel/next.js/releases/v12.0.5
Patch https://github.com/vercel/next.js/security/advisories/GHSA-25mp-g6fv-mqxx
Patch https://github.com/vercel/next.js/commit/6d98b4fb4315dec1badecf0e9bdc212a4272b26...
Patch https://github.com/vercel/next.js/pull/32080
Release Notes https://github.com/vercel/next.js/releases/tag/v11.1.3
Release Notes https://github.com/vercel/next.js/releases/v12.0.5
Patch https://github.com/vercel/next.js/security/advisories/GHSA-25mp-g6fv-mqxx
36
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 5/34 · Minimal
Exposure 5/34 · Minimal