What’s Vulnerable › Vulnerabilities

CVE-2020-17470

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-11 · updated 2026-06-17
• Weakness: CWE-330

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.

Affected products

• Butok Fnet: through 4.6.4

References

• http://fnet.sourceforge.net/manual/fnet_history.html
• https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
• https://www.kb.cert.org/vuls/id/815128
• http://fnet.sourceforge.net/manual/fnet_history.html
• https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
• https://www.kb.cert.org/vuls/id/815128

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