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7.5

Faucet SDN Ryu: Infinite Loop via Malicious Network Message

CVE-2020-35139 · published 3 years ago
Summary

A bug in Faucet SDN Ryu can cause the system to hang indefinitely if it receives a malformed network message. This could disrupt network services, but it's not a data leak or malware threat. To protect your network, update to the latest version of Faucet SDN Ryu.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
Ecosystem VendorProductAffected versions
pip ryu project team ryu <= 4.34
– faucet ryu 4.34
cpe:2.3:a:faucet:ryu:4.34:*:*:*:*:*:*:*
Original advisory text
An issue was discovered in OFPBundleCtrlMsg in parser.py in Faucet SDN Ryu version 4.34, allows remote attackers to cause a denial of service (DoS) (infinite loop).
An issue was discovered in OFPBundleCtrlMsg in parser.py in Faucet SDN Ryu version 4.34, allows remote attackers to cause a denial of service (DoS) (infinite loop).
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker partial control
Severity
7.5 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-770Allocation of Resources Without Limits
CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
Timeline
Published11 Aug 2023
Updated3 Nov 2026
First seen6 Mar 2026
Sources
GHSA-4987-5p3p-9r27 · GHSA
CVE-2020-35139 · NVD
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