by Kastro
Paper/Archive/CVE-2025-55293

CVE-2025-55293

meshtastic firmware — Meshtastic allows crafting of specific NodeInfo packets that overwrite any publicKey saved in the NodeDB

EPSS 0.5%public exploitCVSS 9.8
critical.is priorityof 100
47
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 39.6.396 × 207.9Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
firmware< 2.6.3–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)9.4CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: partial

References

refgithub.com/meshtastic/firmware/security/advisories/GHSA-95pq-gj5v-4fg2refgithub.com/meshtastic/firmware/pull/6372refgithub.com/meshtastic/firmware/commit/cf7f0f9d0895602df3453a4f5cfea843f4e09744