How severe is CVE-2021-40684?

CVE-2021-40684 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2021-40684 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40684?

CVE-2021-40684 affects Talend Esb Runtime. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40684?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-40684 published?

CVE-2021-40684 was published on 2021-09-22 and last updated on 2026-06-17.

CVE-2021-40684

CVE-2021-40684 is a critical-severity vulnerability in Talend Esb Runtime with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Talend Esb Runtime
Published: 2021-09-22
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-40684?: 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.
How severe is CVE-2021-40684?: CVE-2021-40684 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2021-40684 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40684?: CVE-2021-40684 affects Talend Esb Runtime. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40684?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-40684 published?: CVE-2021-40684 was published on 2021-09-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:talend:esb_runtime:*:*:*:*:*:*:*:*

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