Security readout for executives and security teams
Plain-English summary
Affected Next.js sites could be abused as a trusted jumping-off point: a crafted link on the legitimate domain may send a user to an attacker-controlled site. The main business risk is phishing using your brand trust, not direct server compromise.
Executive priority
Treat this as a moderate-priority web trust issue. It is unlikely to be a direct breach path by itself, but it can support convincing phishing campaigns using legitimate domains. Upgrade affected Next.js applications promptly, prioritizing public-facing services.
Technical view
Next.js versions below 11.1.0 could allow open redirect behavior with specially encoded paths when pages/_error.js was statically generated. The issue is CWE-601, CVSS 6.9, network reachable, no authentication required, but user interaction and high attack complexity are reflected in the score.
Likely exposure
Exposure is likely in public or internal web applications built with Next.js below 11.1.0, especially if they use a statically generated pages/_error.js. Customer-facing domains carry higher phishing impact because users may trust links from those domains.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as KEV. The advisory frames impact as phishing via redirect from a trusted domain to an external site, generally not direct harm to the application host.
Researcher notes
Evidence is limited to the CVE record, GitHub advisory, and 11.1.0 release reference. Do not assume broader Next.js versions or unrelated redirect behaviors are affected. Validate dependency version and the statically generated pages/_error.js condition before declaring exposure.
Mitigation direction
- Upgrade affected Next.js applications to version 11.1.0 or later.
- Review Vercel’s advisory for any environment-specific upgrade guidance.
- Prioritize externally reachable applications and customer-facing branded domains.
- After upgrading, redeploy affected applications and confirm the runtime version.
- Strengthen phishing monitoring for suspicious links using trusted application domains.
Validation and detection
- Inventory applications and lockfiles for Next.js versions below 11.1.0.
- Check whether pages/_error.js exists and was statically generated.
- Confirm deployed builds are running Next.js 11.1.0 or later.
- Review application logs for unusual redirect-like traffic patterns.
- Document any remaining legacy deployments awaiting upgrade.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-601: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-37699 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N1.64.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.9MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/vercel/next.js/security/advisories/GHSA-vxf5-wxwp-m7g9CVE reference · x_refsource_CONFIRM
- https://github.com/vercel/next.js/releases/tag/v11.1.0CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
URL Redirection to Untrusted Site ('Open Redirect')
URL Redirection to Untrusted Site ('Open Redirect') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.