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CVE-2025-21608— Forged packets over MQTT can show up in direct messages in Meshtastic firmware

Quick assessment

Affected
meshtastic firmware
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Meshtastic device firmware是Meshtastic开源的一种用于 Meshtastic 设备运行开源、离网、去中心化网状网络的固件。 Meshtastic device firmware存在安全漏洞，该漏洞源于未正确验证MQTT数据包。攻击者利用该漏洞可以伪造消息。

AI Predicted 5.3 Difficulty: Easy EPSS 0.37% · P31
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I. Basic Information for CVE-2025-21608

Vulnerability Information
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Vulnerability Title
Forged packets over MQTT can show up in direct messages in Meshtastic firmware
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
将资源暴露给错误范围
Source: CVE Program / CVE List V5
Vulnerability Title
Meshtastic device firmware 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Meshtastic device firmware是Meshtastic开源的一种用于 Meshtastic 设备运行开源、离网、去中心化网状网络的固件。 Meshtastic device firmware存在安全漏洞，该漏洞源于未正确验证MQTT数据包。攻击者利用该漏洞可以伪造消息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
meshtastic firmware >= 2.5.0, <= 2.5.18 -

II. Public POCs for CVE-2025-21608

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III. Intelligence Information for CVE-2025-21608

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Vendor Advisories for CVE-2025-21608 (1)

IV. Related Vulnerabilities

Same product: firmware
Same vendor: meshtastic
Same weakness: CWE-668