How severe is CVE-2025-12790?

CVE-2025-12790 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2025-12790 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-12790?

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

Does CVE-2025-12790 have an EU (EUVD) identifier?

Yes. CVE-2025-12790 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-38162.

When was CVE-2025-12790 published?

CVE-2025-12790 was published on 2025-11-06 and last updated on 2026-06-17.

CVE-2025-12790

CVE-2025-12790 is a high-severity vulnerability with a CVSS 3.x base score of 7.4. 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-29.

Key facts

Severity: High (CVSS 3.x base score 7.4)
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-38162
Weakness: CWE-29
Published: 2025-11-06
Last modified: 2026-06-17

Description

A flaw was found in Rubygem MQTT. By default, the package used to not have hostname validation, resulting in possible Man-in-the-Middle (MITM) attack.

Frequently asked questions

What is CVE-2025-12790?: A flaw was found in Rubygem MQTT. By default, the package used to not have hostname validation, resulting in possible Man-in-the-Middle (MITM) attack.
How severe is CVE-2025-12790?: CVE-2025-12790 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2025-12790 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-12790?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-12790 have an EU (EUVD) identifier?: Yes. CVE-2025-12790 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-38162.
When was CVE-2025-12790 published?: CVE-2025-12790 was published on 2025-11-06 and last updated on 2026-06-17.

References

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