HOMEVULNERABILITIESCVE-2021-31411
HIGH

CVE-2021-31411

CWE-379Published: May 5, 2021· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

Insecure temporary directory usage in frontend build functionality of com.vaadin:flow-server versions 2.0.9 through 2.5.2 (Vaadin 14.0.3 through Vaadin 14.5.2), 3.0 prior to 6.0 (Vaadin 15 prior to 19), and 6.0.0 through 6.0.5 (Vaadin 19.0.0 through 19.0.4) allows local users to inject malicious code into frontend resources during application rebuilds.

NVD Source

Technical Analysis

CVE-2021-31411 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

vaadin2 product(s)
flowvaadin
Source: NVD CPE · 2 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/10640
PATCHhttps://github.com/vaadin/flow/pull/10640
ADVISORYhttps://vaadin.com/security/cve-2021-31411
ADVISORYhttps://vaadin.com/security/cve-2021-31411

All References (4)

→
https://github.com/vaadin/flow/pull/10640Patch · Third Party Advisory
→
https://vaadin.com/security/cve-2021-31411Vendor Advisory
→
https://github.com/vaadin/flow/pull/10640Patch · Third Party Advisory
→
https://vaadin.com/security/cve-2021-31411Vendor Advisory

Quick Facts

CVE IDCVE-2021-31411
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-379
CISA KEVNo
Affected1 vendor(s)
PublishedMay 5, 2021

Related CVEs (CWE-379)

CVE-2024-9500
7.8
CVE-2023-49797
7.8
CVE-2023-32450
7.8
CVE-2016-9486
7.8
CVE-2021-21100
7.8
CVE-2024-9950
7.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-31411 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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