How severe is CVE-2020-17468?

CVE-2020-17468 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-2020-17468 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-17468?

CVE-2020-17468 affects Butok Fnet. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-17468?

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-2020-17468 published?

CVE-2020-17468 was published on 2020-12-11 and last updated on 2026-06-17.

CVE-2020-17468

CVE-2020-17468 is a high-severity vulnerability in Butok Fnet 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-125.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Butok Fnet
Published: 2020-12-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-17468?: 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.
How severe is CVE-2020-17468?: CVE-2020-17468 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-2020-17468 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-17468?: CVE-2020-17468 affects Butok Fnet. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-17468?: 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-2020-17468 published?: CVE-2020-17468 was published on 2020-12-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:butok:fnet:*:*:*:*:*:*:*:*

More vulnerabilities in Butok Fnet

CVE-2020-27633 — Critical (CVSS 9.1): In FNET 4.6.3, TCP ISNs are improperly random.
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CVE-2020-17467 — Critical (CVSS 9.1): An issue was discovered in FNET through 4.6.4. The code for processing the hostname from an LLMNR request doesn't check…
CVE-2020-17469 — High (CVSS 7.5): An issue was discovered in FNET through 4.6.4. The code for IPv6 fragment reassembly tries to access a previous…
CVE-2020-17470 — Medium (CVSS 5.3): An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface structure does not…

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Other CWE-125 (Out-of-bounds Read) vulnerabilities

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CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

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