How severe is CVE-2020-35139?

CVE-2020-35139 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-35139 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35139?

CVE-2020-35139 affects Faucet Ryu. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35139?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-35139 published?

CVE-2020-35139 was published on 2023-08-11 and last updated on 2026-06-17.

CVE-2020-35139

CVE-2020-35139 is a high-severity vulnerability in Faucet Ryu with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-835.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-835
Affected product: Faucet Ryu
Published: 2023-08-11
Last modified: 2026-06-17

Description

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).

Frequently asked questions

What is CVE-2020-35139?: 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).
How severe is CVE-2020-35139?: CVE-2020-35139 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-35139 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35139?: CVE-2020-35139 affects Faucet Ryu. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35139?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-35139 published?: CVE-2020-35139 was published on 2023-08-11 and last updated on 2026-06-17.

References

https://github.com/faucetsdn/ryu/issues/118

Affected products (1)

cpe:2.3:a:faucet:ryu:4.34:*:*:*:*:*:*:*

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