How severe is CVE-2025-43863?

CVE-2025-43863 has a CVSS 3.x base score of 9.8, 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 high.

Is CVE-2025-43863 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-43863?

CVE-2025-43863 affects Vantage6. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-43863?

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.

Does CVE-2025-43863 have an EU (EUVD) identifier?

Yes. CVE-2025-43863 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18202.

When was CVE-2025-43863 published?

CVE-2025-43863 was published on 2025-06-12 and last updated on 2026-06-17.

CVE-2025-43863

CVE-2025-43863 is a critical-severity vulnerability in Vantage6 with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-307.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 1.7
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-18202
Weakness: CWE-307
Affected product: Vantage6
Published: 2025-06-12
Last modified: 2026-06-17

Description

vantage6 is an open source framework built to enable, manage and deploy privacy enhancing technologies like Federated Learning and Multi-Party Computation. If attacker gets access to an authenticated session, they can try to brute-force the user password by using the change password functionality: they can call that route infinitely which will return the message that password is wrong until it is correct. This vulnerability is fixed in 4.11.

Frequently asked questions

What is CVE-2025-43863?: vantage6 is an open source framework built to enable, manage and deploy privacy enhancing technologies like Federated Learning and Multi-Party Computation. If attacker gets access to an authenticated session, they can try to brute-force the user password by using the change password functionality: they can call that route infinitely which will return the message that password is wrong until it is correct. This vulnerability is fixed in 4.11.
How severe is CVE-2025-43863?: CVE-2025-43863 has a CVSS 3.x base score of 9.8, 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 high.
Is CVE-2025-43863 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-43863?: CVE-2025-43863 affects Vantage6. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-43863?: 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.
Does CVE-2025-43863 have an EU (EUVD) identifier?: Yes. CVE-2025-43863 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18202.
When was CVE-2025-43863 published?: CVE-2025-43863 was published on 2025-06-12 and last updated on 2026-06-17.

References

https://github.com/vantage6/vantage6/security/advisories/GHSA-j6g5-p62x-58hw

Affected products (1)

cpe:2.3:a:vantage6:vantage6:*:*:*:*:*:*:*:*

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