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No exploitation reportedFix available

CVE-2021-33609

No exploitation reported by the sources we read.

  • Published2021-10-13
  • Fixed in8.14.1
  • WeaknessCWE-20 · CWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Missing check in DataCommunicator class in com.vaadin:vaadin-server versions 8.0.0 through 8.14.0 (Vaadin 8.0.0 through 8.14.0) allows authenticated network attacker to cause heap exhaustion by requesting too many rows of data.

Timeline

dates in UTC
  1. 2021-10-1311:15CVE publishedNVD

Versions per branch

NVD · OSV
Vaadin
BranchAffectedFixed in
8.x≥ 8.0.0, < 8.14.18.14.1
8.x≥ 8.0.6, < 8.14.18.14.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Vaadin to 8.14.1

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.14.3known since 2026-10-23
  • NVDCVSS 3.14.3read 2026-10-23
  • NVDCVSS 2.04read 2026-10-23
  • CNAweakness (CWE)CWE-400known since 2026-10-23
  • NVDweakness (CWE)CWE-20read 2026-10-23
  • FIRST EPSSEPSS score0.9 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2021-10-13

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Published
2021-10-13
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-qcgx-crrx-38v5

Frequently asked questions

What is CVE-2021-33609?

Missing check in DataCommunicator class in com.vaadin:vaadin-server versions 8.0.0 through 8.14.0 (Vaadin 8.0.0 through 8.14.0) allows authenticated network attacker to cause heap exhaustion by requesting too many rows of data.

Is CVE-2021-33609 actively exploited?

Active exploitation of CVE-2021-33609 has not been confirmed. Its EPSS score was 0.9% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-33609?

CVE-2021-33609 has a CVSS v3 base score of 4.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

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