HOMEVULNERABILITIESCVE-2021-31408
HIGH

CVE-2021-31408

CWE-613Published: April 23, 2021· Updated: Jun 17, 2026

7.1
CVSS v3.1

Official Description

Authentication.logout() helper in com.vaadin:flow-client versions 5.0.0 prior to 6.0.0 (Vaadin 18), and 6.0.0 through 6.0.4 (Vaadin 19.0.0 through 19.0.3) uses incorrect HTTP method, which, in combination with Spring Security CSRF protection, allows local attackers to access Fusion endpoints after the user attempted to log out.

NVD Source

Technical Analysis

CVE-2021-31408 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 7.1.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected Vendors & Products

vaadin2 product(s)
flowvaadin
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/vaadin/flow/pull/10577
PATCHhttps://github.com/vaadin/flow/pull/10577
ADVISORYhttps://vaadin.com/security/cve-2021-31408
ADVISORYhttps://vaadin.com/security/cve-2021-31408

All References (4)

→
https://github.com/vaadin/flow/pull/10577Patch · Third Party Advisory
→
https://vaadin.com/security/cve-2021-31408Vendor Advisory
→
https://github.com/vaadin/flow/pull/10577Patch · Third Party Advisory
→
https://vaadin.com/security/cve-2021-31408Vendor Advisory

Quick Facts

CVE IDCVE-2021-31408
CVSS Score7.1 / 10
SeverityHIGH
WeaknessCWE-613
CISA KEVNo
Affected1 vendor(s)
PublishedApr 23, 2021

Related CVEs (CWE-613)

CVE-2015-5171
9.8
CVE-2018-6634
9.8
CVE-2025-54592
9.8
CVE-2016-5069
9.8
CVE-2024-13996
9.8
CVE-2018-21018
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-31408 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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