CVE-2020-28349

** DISPUTED ** An inaccurate frame deduplication process in ChirpStack Network Server 3.9.0...

6.5 MediumDisputed

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

2.20%Up 1.2 points since Apr 14, 2021

What each source reports

NVD Score used 6.5

Record: CVE-2020-28349
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 6.8 MediumAV:N/AC:L/Au:S/C:N/I:N/A:C
Weakness: CWE-20
Updated: 2026-11-02

CVE List No score

Record: CVE-2020-28349
Updated: 2026-11-02

EUVDEUVD-2020-20810 No score

Record: EUVD-2020-20810
Updated: 2026-11-03

GitHub AdvisoriesGHSA-xrpw-hmf5-ch3x 6.5

** DISPUTED ** An inaccurate frame deduplication process in ChirpStack Network Server 3.9.0...

** DISPUTED ** 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."

Record: GHSA-xrpw-hmf5-ch3x
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-20
Updated: 2026-11-02

OSV 6.5

Record: CVE-2020-28349
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

chirpstack network server

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-28349 is a medium vulnerability (CVSS 6.5) in Chirpstack Network Server, published November 9, 2020. Its validity is disputed. EPSS puts the chance of exploitation in the next 30 days at 2.20%, the 82nd percentile.