CVE-2024-34489: OFPHello in parser.py in Faucet SDN Ryu 4.34 allows attackers to cause a denial of service (infinite loop) via

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HIGH 7.5REMOTEDOWNGRADE

CVE-2024-34489 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.

OFPHello in parser.py in Faucet SDN Ryu 4.34 allows attackers to cause a denial of service (infinite loop) via length=0.

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	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-835
Published	2024-05-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: facuet

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

Am I affected?

Timeline

2024-05-05 03:15 UTCPublished CVE record published
2026-06-17 07:33 UTCUpdated Record last modified

facuet 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-2024-34489?

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

Is CVE-2024-34489 being exploited?

CVE-2024-34489 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-2024-34489 affect?

CVE-2024-34489 affects ryu. Severity is high (CVSS 7.5). OFPHello in parser.py in Faucet SDN Ryu 4.34 allows attackers to cause a denial of service (infinite loop) via length=0.

How urgent is CVE-2024-34489?

Priority 49/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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