CVE-2020-17467

Name: CVE-2020-17467
Creator: NVD / NIST
Published: 2020-12-11T23:15:13.557+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 3.04%

Last modified Jun 17, 2026

CVE-2020-17467 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. An issue was discovered in FNET through 4.6.4. The code for processing the hostname from an LLMNR request doesn't check for '\0' termination. EPSS estimates a 3.04% chance of exploitation in the next 30 days.

Description

An issue was discovered in FNET through 4.6.4. The code for processing the hostname from an LLMNR request doesn't check for '\0' termination. Therefore, the deduced length of the hostname doesn't reflect the correct length of the actual data. This may lead to Information Disclosure in _fnet_llmnr_poll in fnet_llmnr.c during a response to a malicious request of the DNS class IN.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS Probability

3.04%

85.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Butok	Fnet	<= 4.6.4

References

http://fnet.sourceforge.net/manual/fnet_history.htmlRelease Notes, Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01Third Party Advisory, US Government Resource
https://www.kb.cert.org/vuls/id/815128Third Party Advisory, US Government Resource
http://fnet.sourceforge.net/manual/fnet_history.htmlRelease Notes, Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01Third Party Advisory, US Government Resource
https://www.kb.cert.org/vuls/id/815128Third Party Advisory, US Government Resource

Timeline

Published: Dec 11, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-17467?

How severe is CVE-2020-17467?

CVE-2020-17467 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 3.04% probability of exploitation in the next 30 days.

How do I fix CVE-2020-17467?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-17467?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST