What’s Vulnerable › Vulnerabilities

CVE-2020-28349

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-11-09 · updated 2026-06-17
• Weakness: CWE-20

Description

An inaccurate frame deduplication process in ChirpStack Network Server 3.9.0 allows a malicious gateway to perform uplink Denial of Service via malformed frequency attributes in CollectAndCallOnceCollect in internal/uplink/collect.go. NOTE: the vendor's position is that there are no "guarantees that allowing untrusted LoRa gateways to the network should still result in a secure network.

Affected products

• chirpstack Network Server: 3.9.0

References

• https://github.com/brocaar/chirpstack-network-server/commit/874fc1a9b01045ebe8a340f0bb01ed19e8256e60
• https://github.com/brocaar/chirpstack-network-server/commit/f996bb0c6c85281b5658f59ff09db1b4a73db453
• https://www.cyberark.com/resources/threat-research-blog/lorawan-mqtt-what-to-know-when-securing-your-iot-network
• https://github.com/brocaar/chirpstack-network-server/commit/874fc1a9b01045ebe8a340f0bb01ed19e8256e60
• https://github.com/brocaar/chirpstack-network-server/commit/f996bb0c6c85281b5658f59ff09db1b4a73db453
• https://www.cyberark.com/resources/threat-research-blog/lorawan-mqtt-what-to-know-when-securing-your-iot-network

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