HOMEVULNERABILITIESCVE-2021-31405
HIGH

CVE-2021-31405

CWE-400Published: April 23, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

Unsafe validation RegEx in EmailField component in com.vaadin:vaadin-text-field-flow versions 2.0.4 through 2.3.2 (Vaadin 14.0.6 through 14.4.3), and 3.0.0 through 4.0.2 (Vaadin 15.0.0 through 17.0.10) allows attackers to cause uncontrolled resource consumption by submitting malicious email addresses.

NVD Source

Technical Analysis

CVE-2021-31405 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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-components/pull/442
PATCHhttps://github.com/vaadin/flow-components/pull/442
ADVISORYhttps://vaadin.com/security/cve-2021-31405
ADVISORYhttps://vaadin.com/security/cve-2021-31405

All References (4)

→
https://github.com/vaadin/flow-components/pull/442Patch · Third Party Advisory
→
https://vaadin.com/security/cve-2021-31405Vendor Advisory
→
https://github.com/vaadin/flow-components/pull/442Patch · Third Party Advisory
→
https://vaadin.com/security/cve-2021-31405Vendor Advisory

Quick Facts

CVE IDCVE-2021-31405
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-400
CISA KEVNo
Affected1 vendor(s)
PublishedApr 23, 2021

Related CVEs (CWE-400)

CVE-2015-4412
9.8
CVE-2017-1000378
9.8
CVE-2017-9119
9.8
CVE-2026-30141
9.8
CVE-2025-61303
9.8
CVE-2019-10952
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-31405 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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