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CVE-2020-35217 Vert.x-Web

Affected softwareVert.x-Web
Severity8.8 High CVSS 3.1 2 scores
Fixed in4.0.0-milestone5
WeaknessCross-site request forgery (CWE-352)
Published20 Jan 2021
Updated17 Jun 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 5 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 0.59% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: vert-x3/vertx-web #1613.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://github.com/vert-x3/vertx-web/pull/1613 : a pull request: the change under review

CVSS

8.8 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
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 NVD Primary published
CVSS 2.0 6.8 none AV:N/AC:M/Au:N/C:P/I:P/A:P NVD Primary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
io.vertx:vertx-web 4.0.0-milestone1 4.0.0-milestone5 unbounded
io.vertx:vertx-web 4.0.0-milestone2 4.0.0-milestone5 unbounded
io.vertx:vertx-web 4.0.0-milestone3 4.0.0-milestone5 unbounded
io.vertx:vertx-web 4.0.0-milestone4 4.0.0-milestone5 unbounded

Products and versions

2 products, 8 version entries
SourceVendorProductSchemeAffected versions
nvd eclipse vert.x-web generic 4.0.0:milestone1 · 4.0.0:milestone2 · 4.0.0:milestone3 · 4.0.0:milestone4
osv io.vertx vertx-web generic ≥ 4.0.0 and < 4.0.0

References

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

Timeline

Published2021-01-20By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.