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CVE-2021-33609
Denial of service in DataCommunicator class in Vaadin 8
Medium4.3EPSS 0.95%
- Published
- Updated
- Reserved
- Assigned by
- Vaadin
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
ID reserved
By Vaadin
- 5 months later
· 5 months later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| VaadinCNA (assigner) | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
| NVDNVD · Modified | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
- EPSS (exploitation in 30 days)
- 0.95% · top 39% of all CVEs (8 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Weakness
Affected products
- affected 8.0.0 – < unspecified
- affected unspecified – ≤ 8.14.0
- affected 8.0.0 – < unspecified
- affected unspecified – ≤ 8.14.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Mavencom.vaadin:vaadin-serverGHSA-qcgx-crrx-38v5 (opens in a new tab)
References (2)
- https://vaadin.com/security/cve-2021-33609 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/vaadin/framework/pull/12415 (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-qcgx-crrx-38v5 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-33609)Record last updated .