CVE-2020-35217
Cross-Site Request Forgery in Vert.x-Web framework
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
8.8
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.
- Record
CVE-2020-35217- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-352
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2020-35217- Updated
- 2026-11-02
EUVDEUVD-2021-0807 No score
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.
- Record
EUVD-2021-0807- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-9q69-g5gc-9fgf
8.8
Cross-Site Request Forgery in Vert.x-Web framework
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.
- Record
GHSA-9q69-g5gc-9fgf- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-352
- Updated
- 2026-11-02
OSV
8.8
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.
- Record
CVE-2020-35217- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-9q69-g5gc-9fgf
8.8
Cross-Site Request Forgery in Vert.x-Web framework
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.
- Record
GHSA-9q69-g5gc-9fgf- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-352
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
io.vertx:vertx-webMaven |
4.0.0-milestone1 to 4.0.0-milestone1 | 4.0.0-milestone5 |
io.vertx:vertx-webMaven |
4.0.0-milestone2 to 4.0.0-milestone2 | 4.0.0-milestone5 |
io.vertx:vertx-webMaven |
4.0.0-milestone3 to 4.0.0-milestone3 | 4.0.0-milestone5 |
io.vertx:vertx-webMaven |
4.0.0-milestone4 to 4.0.0-milestone4 | 4.0.0-milestone5 |
io.vertx:vertx-webMaven |
4.0.0-milestone1 up to 4.0.0-milestone5, plus listed versions 4.0.0-milestone24.0.0-milestone34.0.0-milestone4 |
4.0.0-milestone5 |
io.vertx:vertx-webMaven |
4.0.0-milestone2 up to 4.0.0-milestone5, plus listed versions 4.0.0-milestone34.0.0-milestone4 |
4.0.0-milestone5 |
io.vertx:vertx-webMaven |
4.0.0-milestone3 up to 4.0.0-milestone5, plus listed versions 4.0.0-milestone4 |
4.0.0-milestone5 |
io.vertx:vertx-webMaven |
4.0.0-milestone4 up to 4.0.0-milestone5 | 4.0.0-milestone5 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-35217 is a high vulnerability (CVSS 8.8) in Eclipse Vert.x-web, published January 20, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.59%, the 48th percentile. Fixed in io.vertx:vertx-web 4.0.0-milestone5.