Ryu Infinite Loop vulnerability

published 2024-05-05 2 y ago modified 2026-07-07 4 mo ago also GHSA-ffp9-pfq9-g2ww , PYSEC-2026-1881 , EUVD-2024-1600

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits: 0; none known

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

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 2 y ago (2024-05-06)

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/faucetsdn/ryu/issues/191 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
pypi	ryu	<=4.34	no fix listed

Affected products

facuet ryu

Classification

Weakness

CWE-835 Loop with Unreachable Exit Condition

References

github.com /faucetsdn/ryu/issues/191
web, exploit, issue-tracking, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2024-34488
advisory
github.com /faucetsdn/ryu
package
pypi.org /project/ryu
package
github.com /advisories/GHSA-ffp9-pfq9-g2ww
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary