Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:vaadin-server versions 7.0.0 through 7.7.23 (Vaadin 7.0.0 through 7.7.23), and 8.0.0 through 8.12.2 (Vaadin 8.0.0 through 8.12.2) allows attacker to guess a security token via timing attack
CVE-2021-31403
MEDIUMNVD 4.04.0—
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 4.0 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 68% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
4.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.0Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 4.0
- EG Score
- 4.0(medium)
- EPSS
- 22.4%
- KEV
- Not listed
Published
April 23, 2021
Last Modified
November 21, 2024
References (6)
- security@vaadinhttps://github.com/vaadin/framework/pull/12188
- security@vaadinhttps://github.com/vaadin/framework/pull/12190
- security@vaadinhttps://vaadin.com/security/cve-2021-31403
- af854a3a-2127-422b-91ae-364da2661108https://github.com/vaadin/framework/pull/12188
- af854a3a-2127-422b-91ae-364da2661108https://github.com/vaadin/framework/pull/12190
- af854a3a-2127-422b-91ae-364da2661108https://vaadin.com/security/cve-2021-31403
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Frequently asked(5)
What is CVE-2021-31403?
CVE-2021-31403 is a medium vulnerability published on April 23, 2021. Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:vaadin-server versions 7.0.0 through 7.7.23 (Vaadin 7.0.0 through 7.7.23), and 8.0.0 through 8.12.2 (Vaadin 8.0.0 through 8.12.2) allows attacker to guess a security token via timing attack
When was CVE-2021-31403 disclosed?
CVE-2021-31403 was first published in the National Vulnerability Database on April 23, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-31403 actively exploited?
CVE-2021-31403 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-31403?
CVE-2021-31403 has a CVSS v3 base score of 4.0 (NVD).
How do I remediate CVE-2021-31403?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-31403, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2021-31403
Is Your Infrastructure Affected by CVE-2021-31403?
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