CVE-2020-17468

Name: CVE-2020-17468
Creator: NVD / NIST
Published: 2020-12-11T23:15:13.62+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.96%

Last modified Jun 17, 2026

CVE-2020-17468 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in FNET through 4.6.4. The code for processing the hop-by-hop header (in the IPv6 extension headers) doesn't check for a valid length of an extension header, and therefore an out-of-bounds read can occur in _fnet_ip6_ext_header_handler_options in fnet_ip6.c, leading to Denial-of-Service.. EPSS estimates a 2.96% chance of exploitation in the next 30 days.

Description

An issue was discovered in FNET through 4.6.4. The code for processing the hop-by-hop header (in the IPv6 extension headers) doesn't check for a valid length of an extension header, and therefore an out-of-bounds read can occur in _fnet_ip6_ext_header_handler_options in fnet_ip6.c, leading to Denial-of-Service.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.96%

85.4th 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-2020-17468?

How severe is CVE-2020-17468?

CVE-2020-17468 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.96% probability of exploitation in the next 30 days.

How do I fix CVE-2020-17468?

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-2020-17468?

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

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Source: NVD / NIST