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CVE-2021-29624

22
FAUCET Score

CVE-2021-29624 describes a Cross-Site Request Forgery (CSRF) vulnerability in fastify-csrf versions prior to 3.1.0, specifically impacting applications deployed across multiple subdomains using a "double submit" mechanism with cookies. The vulnerability has a CVSS score of 6.5 (Medium), indicating it can be exploited remotely with low attack complexity, requiring user interaction, and potentially leading to high integrity impacts. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage regarding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.1.0CPE matchmatch criteria
cpe:2.3:a:fastify:fastify-csrf:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.83%
Probability of exploitation in next 30 days
EPSS Percentile
53.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0083 is in the 63rd percentile among its peer group of 26,221 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: fastify-csrfFixed in: 3.1.0

Vendor Advisories (1)

npmGHSA-rc4q-9m69-gqp8medium

Lack of protection against cookie tossing attacks in fastify-csrf

May 17, 2021

References

cheatsheetseries.owasp.org / cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html
Third Party Advisory
github.com / fastify/csrf/pull/2
PatchThird Party Advisory
github.com / fastify/fastify-csrf/pull/51
PatchThird Party Advisory
github.com / fastify/fastify-csrf/releases/tag/v3.1.0
Third Party Advisory
github.com / fastify/fastify-csrf/security/advisories/GHSA-rc4q-9m69-gqp8
PatchThird Party Advisory
owasp.org / www-pdf-archive/David_Johansson-Double_Defeat_of_Double-Submit_Cookie.pdf
Third Party Advisory