---
id: CVE-2020-35141
aliases:
  - GHSA-5x64-925v-h4gv
  - PYSEC-2026-1878
title: FaucetSDN Ryu Denial of Service Vulnerability
summary: FaucetSDN Ryu Denial of Service Vulnerability
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: ryu
product: ryu
ecosystem: pip
affected:
  - ryu <= 4.34
published: '2023-08-11'
updated: '2026-07-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-5x64-925v-h4gv'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2020-35141'
  - url: 'https://github.com/faucetsdn/ryu/issues/118'
  - url: 'https://github.com/faucetsdn/ryu'
tags:
  - osv
  - pip
epss: 0.00954
epssPercentile: 0.59886
ingestedAt: '2026-07-08T18:25:46.240Z'
---

## Overview

An issue was discovered in `OFPQueueGetConfigReply` in `parser.py` in FaucetSDN Ryu version 4.34, allows remote attackers to cause a denial of service (DoS) (infinite loop).

## Affected packages

- `ryu <= 4.34`

## Remediation

Refer to the advisory for the patched release.