Home/CVE/fastify-csrf is an open-source plugin helps developers protect their Fastify server against CSRF attacks. Versions of fa
CVE

CVE-2021-29624

fastify-csrf is an open-source plugin helps developers protect their Fastify server against CSRF attacks. Versions of fa

fastify-csrf is an open-source plugin helps developers protect their Fastify server against CSRF attacks. Versions of fastify-csrf prior to 3.1.0 have a "double submit" mechanism using cookies with an application deployed across multiple subdomains, e.g. "heroku"-style platform as a service. Version 3.1.0 of the fastify-csrf fixes it. the vulnerability.

The user of the module would need to supply a userInfo when generating the CSRF token to fully implement the protection on their end. This is needed only for applications hosted on different subdomains.

MEDIUM · CVSS 6.5 EPSS 0.00168
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-352Cross-Site Request Forgery (CSRF)
CWE-565Reliance on Cookies without Validation and Integrity Checking
▤

Affected Products & Versions

1
fastify fastify-csrf< 3.1.0
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
npm fastify-csrf MODERATE fixed in 3.1.0
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD19 May 2021 · 10:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.htmlThird Party Advisory
https://github.com/fastify/csrf/pull/2PatchThird Party Advisory
https://github.com/fastify/fastify-csrf/pull/51PatchThird Party Advisory
https://github.com/fastify/fastify-csrf/releases/tag/v3.1.0Third Party Advisory
https://github.com/fastify/fastify-csrf/security/advisories/GHSA-rc4q-9m69-gqp8PatchThird Party Advisory
https://owasp.org/www-pdf-archive/David_Johansson-Double_Defeat_of_Double-Submit_Cookie.pdfThird Party Advisory
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