Auth bypass in Meshtastic Firmware
CVE-2025-55293
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L.
EPSS exploit prediction
EPSS: 0.005 (38.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000
Affected products
- Meshtastic Firmware — versions < 2.6.3
- Meshtastic Firmware
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/meshtastic/firmware/security/advisories/GHSA-95pq-gj5v-4fg2 (Vendor Advisory)
- github.com/meshtastic/firmware/pull/6372 (Patch, Issue Tracking)
- github.com/meshtastic/firmware/commit/cf7f0f9d0895602df3453a4f5cfea843f4e09744 (Patch)
Frequently asked questions
- What is CVE-2025-55293?
- CVE-2025-55293 is a critical-severity vulnerability in Meshtastic Firmware, classified under Improper Authentication. CVSS score: 9.4/10. Published 2025-08-18.
- How severe is CVE-2025-55293?
- Critical severity. CVSS v3 base score is 9.4 out of 10.
- Is CVE-2025-55293 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.