Vulnerability in Vaadin Flow-Server
CVE-2021-33604
URL encoding error in development mode handler in com.vaadin:flow-server versions 2.0.0 through 2.6.1 (Vaadin 14.0.0 through 14.6.1), 3.0.0 through 6.0.9 (Vaadin 15.0.0 through 19.0.8) allows local user to execute arbitrary JavaScript code by opening crafted URL in browser.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.5 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Vaadin Flow-Server — versions 2.0.0, unspecified, 3.0.0
- Vaadin — versions 14.0.0, unspecified, 15.0.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- vaadin.com/security/cve-2021-33604 (Vendor Advisory)
- github.com/vaadin/flow/pull/11099 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-33604?
- CVE-2021-33604 is a low-severity vulnerability in Vaadin Flow-Server, classified under CWE-172. CVSS score: 2.5/10. Published 2021-06-24.
- How severe is CVE-2021-33604?
- Low severity. CVSS v3 base score is 2.5 out of 10.
- Is CVE-2021-33604 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.