CVE-2021-31404
low-risk
Published 2021-04-23
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.
Do I need to act?
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0.04% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.0/10
Medium
LOCAL
/ HIGH complexity
Affected Products (2)
Flow
Affected Vendors
References (4)
Vendor Advisory
https://vaadin.com/security/cve-2021-31404
Vendor Advisory
https://vaadin.com/security/cve-2021-31404
17
/ 100
low-risk
Severity
10/34 · Low
Exploitability
0/34 · Minimal
Exposure
7/34 · Low