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CVE-2025-55293

Meshtastic Firmware authentication bypass

9.4 CRITICALEPSS 0.44%
  1. Published18 Aug 2025

Description

Meshtastic is an open source mesh networking solution. Prior to v2.6.3, an attacker can send NodeInfo with a empty publicKey first, then overwrite it with a new key. First sending a empty key bypasses 'if (p.public_key.size > 0) {', clearing the existing publicKey (and resetting the size to 0) for a known node. Then a new key bypasses 'if (info->user.public_key.size > 0) {', and this malicious key is stored in NodeDB. This vulnerability is fixed in 2.6.3.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Affected products

Meshtastic Firmware< 2.6.3

Remediation

Fixed in
Meshtastic Firmware≥ 2.6.3

References

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Frequently asked

Is CVE-2025-55293 being actively exploited?

CVE-2025-55293 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.44%.

How severe is CVE-2025-55293?

CVE-2025-55293 has a CVSS 3.1 base score of 9.4, rated critical. EPSS estimates a 0.44% probability of exploitation.

Which products are affected by CVE-2025-55293?

Affected products include Meshtastic Firmware.

How do I fix CVE-2025-55293?

Upgrade affected software to a fixed version, for example Meshtastic Firmware 2.6.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-55293 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.