Low severity · published Apr 23, 2021
CVE-2021-31406
Non-constant-time comparison of CSRF tokens in endpoint request handler in com.vaadin:flow-server versions 3.0.0 through 5.0.3 (Vaadin 15.0.0 through 18.0.6), and…
2.5
CVSS
0.2%
EPSS
No
On KEV
Description
Non-constant-time comparison of CSRF tokens in endpoint request handler in com.vaadin:flow-server versions 3.0.0 through 5.0.3 (Vaadin 15.0.0 through 18.0.6), and com.vaadin:fusion-endpoint version 6.0.0 (Vaadin 19.0.0) allows attacker to guess a security token for Fusion endpoints via timing attack.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FL
Flow · Vaadin
3.0.0 before 5.0.4; 6.0.0 · source: NVD
VA
Vaadin · Vaadin
15.0.0 before 18.0.7; 19.0.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-31406
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-31406
Patch
https://github.com/vaadin/flow/pull/10157
Vendor Advisory
https://vaadin.com/security/cve-2021-31406
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