CVE-2020-17469

HIGH
7.5
CVSS Score
Published: December 11, 2020 at 10:39 PM UTC
Updated: June 17, 2026 at 02:58 AM UTC
1 product affected across 1 vendorFnet

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Severity
HIGH7.5
Exploit prediction
EPSS 3%

Description

An issue was discovered in FNET through 4.6.4. The code for IPv6 fragment reassembly tries to access a previous fragment starting from a network incoming fragment that still doesn't have a reference to the previous one (which supposedly resides in the reassembly list). When faced with an incoming fragment that belongs to a non-empty fragment list, IPv6 reassembly must check that there are no empty holes between the fragments: this leads to an uninitialized pointer dereference in _fnet_ip6_reassembly in fnet_ip6.c, and causes Denial-of-Service.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≤ 4.6.4

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_CONFIRMRelease NotesThird Party Advisory
http://fnet.sourceforge.net/manual/fnet_history.html
x_refsource_MISCThird Party AdvisoryUS Government Resource
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
x_refsource_MISCThird Party AdvisoryUS Government Resource
https://www.kb.cert.org/vuls/id/815128

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-824

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