What’s Vulnerable › Vulnerabilities

CVE-2020-35217

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-01-20 · updated 2026-06-17
• Weakness: CWE-352

Description

Vert.x-Web framework v4.0 milestone 1-4 does not perform a correct CSRF verification. Instead of comparing the CSRF token in the request with the CSRF token in the cookie, it compares the CSRF token in the cookie against a CSRF token that is stored in the session. An attacker does not even need to provide a CSRF token in the request because the framework does not consider it. The cookies are automatically sent by the browser and the verification will always succeed, leading to a successful CSRF attack.

Affected products

• Eclipse Vert.x: 4.0.0-milestone1, 4.0.0-milestone2, 4.0.0-milestone3, 4.0.0-milestone4

References

• https://github.com/vert-x3/vertx-web/pull/1613
• https://github.com/vert-x3/vertx-web/pull/1613

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