Vulnerability Monitor

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CVE-2021-43803

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.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 2 products from vercel, from nodejs organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-12-10T00:15:11.827

Last Modified

2024-11-21T06:29:49.447

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

8.6

Impact Score

2.9

Weaknesses

Type: Secondary
CWE-20
Type: Primary
NVD-CWE-noinfo

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	vercel	next.js	< 11.1.3	Yes
Application	vercel	next.js	< 12.0.5	Yes
Application	nodejs	node.js	> 15.0.0	No

References

https://github.com/vercel/next.js/commit/6d98b4fb4315dec1badecf0e9bdc212a4272b264 Patch, Third Party Advisory ([email protected])
https://github.com/vercel/next.js/pull/32080 Patch, Third Party Advisory ([email protected])
https://github.com/vercel/next.js/releases/tag/v11.1.3 Release Notes, Third Party Advisory ([email protected])
https://github.com/vercel/next.js/releases/v12.0.5 Release Notes, Third Party Advisory ([email protected])
https://github.com/vercel/next.js/security/advisories/GHSA-25mp-g6fv-mqxx Patch, Third Party Advisory ([email protected])
https://github.com/vercel/next.js/commit/6d98b4fb4315dec1badecf0e9bdc212a4272b264 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/vercel/next.js/pull/32080 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/vercel/next.js/releases/tag/v11.1.3 Release Notes, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/vercel/next.js/releases/v12.0.5 Release Notes, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/vercel/next.js/security/advisories/GHSA-25mp-g6fv-mqxx Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For vercel's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.