CVE-2020-17470

MEDIUM

FNET < 4.6.4 - DNS Cache Poisoning via Predictable Transaction IDs

Title source: llm

Description

An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface structure does not set sufficiently random transaction IDs (they are always set to 1 in _fnet_dns_poll in fnet_dns.c). This significantly simplifies DNS cache poisoning attacks.

References (3)

Core 3

Core References

Third Party Advisory, US Government Resource x_refsource_misc

https://www.kb.cert.org/vuls/id/815128

Third Party Advisory, US Government Resource x_refsource_misc

https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01

Release Notes, Third Party Advisory x_refsource_confirm

http://fnet.sourceforge.net/manual/fnet_history.html

Scores

CVSS v3 5.3

EPSS 0.0207

EPSS Percentile 78.9%

Attack Vector NETWORK

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

Details

CWE

CWE-330

Status published

Products (1)

butok/fnet < 4.6.4

Published Dec 11, 2020

Tracked Since Feb 18, 2026