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CVE-2021-31403

Timing side channel vulnerability in UIDL request handler in Vaadin 7 and 8

LOW
2.5
CVSS Score
Published: April 23, 2021 at 04:05 PM UTC
Updated: June 17, 2026 at 03:51 AM UTC
1 product affected across 1 vendorVaadin

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Severity
LOW2.5
Exploit prediction
EPSS 0.3%

Description

Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:vaadin-server versions 7.0.0 through 7.7.23 (Vaadin 7.0.0 through 7.7.23), and 8.0.0 through 8.12.2 (Vaadin 8.0.0 through 8.12.2) allows attacker to guess a security token via timing attack

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Vaadin· Vaadinmaven
95%
v ≥ 7.0.07.0.0 ≤ v < 7.7.248.0.0 ≤ v < 8.12.37.0.0
Affected range stops below 7.7.24, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.12.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/vaadin/framework/pull/12188
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/vaadin/framework/pull/12190
x_refsource_MISCVendor Advisory
Source: [email protected]
https://vaadin.com/security/cve-2021-31403

CVSS

2.5LOW[email protected]
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-208CWE-203

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