How severe is CVE-2025-21608?

CVE-2025-21608 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-21608 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.

What products are affected by CVE-2025-21608?

CVE-2025-21608 affects Meshtastic Meshtastic Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-21608?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-21608 have an EU (EUVD) identifier?

Yes. CVE-2025-21608 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-5098.

When was CVE-2025-21608 published?

CVE-2025-21608 was published on 2025-02-18 and last updated on 2026-06-17.

CVE-2025-21608

CVE-2025-21608 is a medium-severity vulnerability in Meshtastic Meshtastic Firmware with a CVSS 3.x base score of 5.3. 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-668.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 5.3
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-5098
Weakness: CWE-668
Affected product: Meshtastic Meshtastic Firmware
Published: 2025-02-18
Last modified: 2026-06-17

Description

Meshtastic is an open source mesh networking solution. In affected firmware versions crafted packets over MQTT are able to appear as a DM in client to a node even though they were not decoded with PKC. This issue has been addressed in version 2.5.19 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

Frequently asked questions

What is CVE-2025-21608?: Meshtastic is an open source mesh networking solution. In affected firmware versions crafted packets over MQTT are able to appear as a DM in client to a node even though they were not decoded with PKC. This issue has been addressed in version 2.5.19 and all users are advised to upgrade. There are no known workarounds for this vulnerability.
How severe is CVE-2025-21608?: CVE-2025-21608 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2025-21608 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.
What products are affected by CVE-2025-21608?: CVE-2025-21608 affects Meshtastic Meshtastic Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-21608?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-21608 have an EU (EUVD) identifier?: Yes. CVE-2025-21608 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-5098.
When was CVE-2025-21608 published?: CVE-2025-21608 was published on 2025-02-18 and last updated on 2026-06-17.

References

https://github.com/meshtastic/firmware/security/advisories/GHSA-c967-qc39-3hf5

Affected products (1)

cpe:2.3:o:meshtastic:meshtastic_firmware:*:*:*:*:*:*:*:*

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