CVE-2020-35141: An issue was discovered in OFPQueueGetConfigReply in parser.py in Faucet SDN Ryu version 4.34, allows remote a

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HIGH 7.5REMOTEDOWNGRADE

CVE-2020-35141 is a high-severity flaw (CVSS 7.5) affecting ryu. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-835
Published	2023-08-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: faucet

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-08-11 14:15 UTCPublished CVE record published
2026-06-17 03:13 UTCUpdated Record last modified

faucet ryu DOWNGRADE

Affected: 4.34

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.34

1. Check installed version

apt-cache policy ryu || rpm -q ryu || ryu --version

2. No fixed release: DOWNGRADE to a release before 4.34 (Debian / Ubuntu)

apt-cache madison ryu sudo apt install ryu=<VERSION_BEFORE_4.34> sudo apt-mark hold ryu

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ryu sudo dnf downgrade ryu-<VERSION_BEFORE_4.34> sudo dnf versionlock add ryu

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-35141?

ryu: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-35141 being exploited?

CVE-2020-35141 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-35141 affect?

CVE-2020-35141 affects ryu. Severity is high (CVSS 7.5). An issue was discovered in OFPQueueGetConfigReply in parser.py in Faucet SDN Ryu version 4.34, allows remote attackers to cause a denial of service (DoS) (infinite loop).

How urgent is CVE-2020-35141?

Priority 52/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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CVE-2024-34486 HIGH 7.5 DOWNGRADE OFPPacketQueue in parser.py in Faucet SDN Ryu 4.34 allows attackers to cause a denial of service (infinite loo
CVE-2024-34484 MEDIUM 5.3 DOWNGRADE OFPBucket in parser.py in Faucet SDN Ryu 4.34 allows attackers to cause a denial of service (infinite loop) vi

References

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