Is CVE-2021-40684 actively exploited?

Yes. CVE-2021-40684 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-40684 be exploited remotely?

The attack vector of CVE-2021-40684 has not been classified yet.

What is the CVSS score of CVE-2021-40684?

CVE-2021-40684 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-40684

UNKNOWNCISA KEVIN THE WILD

CVE-2021-40684

Published: April 11, 2026

EPSS:0.62%probability of exploitation in 30 daysPercentile:69.9th

Official Description

Talend ESB Runtime in all versions from 5.1 to 7.3.1-R2021-09, 7.2.1-R2021-09, 7.1.1-R2021-09, has an unauthenticated Jolokia HTTP endpoint which allows remote access to the JMX of the runtime container, which would allow an attacker the ability to read or modify the container or software running in the container.

NVD Source

Technical Analysis

CVE-2021-40684 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-40684 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.