No exploitation reportedFix available

CVE-2019-25027

Q: Is CVE-2019-25027 actively exploited?

Active exploitation of CVE-2019-25027 has not been confirmed. Its EPSS score was 0.7% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2019-25027?

CVE-2019-25027 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

No exploitation reported by the sources we read.

Published2021-04-23
Fixed in13.0.6 · 10.0.14
WeaknessCWE-79 · CWE-81

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 output sanitization in default RouteNotFoundError view in com.vaadin:flow-server versions 1.0.0 through 1.0.10 (Vaadin 10.0.0 through 10.0.13), and 1.1.0 through 1.4.2 (Vaadin 11.0.0 through 13.0.5) allows attacker to execute malicious JavaScript via crafted URL

Timeline

dates in UTC

2021-04-2316:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-25027?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-25027?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Vaadin

Branch	Affected	Fixed in	Source
13.0	≥ 11.0.0, < 13.0.6	13.0.6	NVD
10.0	≥ 10.0.0, < 10.0.14	10.0.14	NVD

Vaadin flow

Branch	Affected	Fixed in	Source
1.x	≥ 1.1.0, < 1.4.3	1.4.3	NVD · OSV
1.0	≥ 1.0.0, < 1.0.11	1.0.11	NVD · OSV

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

Fix

Update Vaadin to 13.0.6 · 10.0.14

Advisories and patches

github.comPatch
vaadin.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.16.1read 2026-10-23
NVDCVSS 3.16.1read 2026-10-23
NVDCVSS 2.04.3read 2026-10-23
CNAweakness (CWE)CWE-81read 2026-10-23
NVDweakness (CWE)CWE-79read 2026-10-23
FIRST EPSSEPSS score0.7 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Published: 2021-04-23
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2019-25027?

Is CVE-2019-25027 actively exploited?

Active exploitation of CVE-2019-25027 has not been confirmed. Its EPSS score was 0.7% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-25027?

CVE-2019-25027 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

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