Low severity · published Apr 23, 2021
CVE-2021-31404
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…
2.5
CVSS
0.2%
EPSS
No
On KEV
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 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
1.0.0 before 1.0.14; 1.1.0 before 2.0.0; 2.0.0 before 2.4.7; 3.0.0 before 5.0.0; 5.0.0 before 5.0.3 · source: NVD
VA
Vaadin · Vaadin
10.0.0 before 10.0.17; 11.0.0 before 14.0.0; 14.0.0 before 14.4.7; 15.0.0 before 17.0.0; 18.0.0 before 18.0.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-31404
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-31404
Patch
https://github.com/vaadin/flow/pull/9875
Vendor Advisory
https://vaadin.com/security/cve-2021-31404
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