CVE-2021-31404

LOW
Published Apr 23, 20215y ago · Modified Jun 17, 20262w ago
2.5 CVSS 3.1
Low
Find Similar
Published Apr 23, 2021 5y ago
Last Modified Jun 17, 2026 2w ago

Description

Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:flow-server versions 1.0.0 through 1.0.13 (Vaadin 10.0.0 through 10.0.16), 1.1.0 prior to 2.0.0 (Vaadin 11 prior to 14), 2.0.0 through 2.4.6 (Vaadin 14.0.0 through 14.4.6), 3.0.0 prior to 5.0.0 (Vaadin 15 prior to 18), and 5.0.0 through 5.0.2 (Vaadin 18.0.0 through 18.0.5) allows attacker to guess a security token via timing attack.

CVSS Details

Base Score
2.5
Exploitability
1.0
Impact
1.4
Vector string
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity None
Availability None

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-203
CWE-208

Affected Products 10

VendorProductVersionRange
vaadinflow*≥1.0.0  –  <1.0.14
vaadinflow*≥1.1.0  –  <2.0.0
vaadinflow*≥2.0.0  –  <2.4.7
vaadinflow*≥3.0.0  –  <5.0.0
vaadinflow*≥5.0.0  –  <5.0.3
vaadinvaadin*≥10.0.0  –  <10.0.17
vaadinvaadin*≥11.0.0  –  <14.0.0
vaadinvaadin*≥14.0.0  –  <14.4.7
vaadinvaadin*≥15.0.0  –  <17.0.0
vaadinvaadin*≥18.0.0  –  <18.0.6

References 2

  • github.com https://github.com/vaadin/flow/pull/9875
    PatchThird Party Advisory
  • vaadin.com https://vaadin.com/security/cve-2021-31404
    Vendor Advisory

Remediation

  • github.com https://github.com/vaadin/flow/pull/9875
    PatchThird Party Advisory