Vulnerability in Butok Fnet
CVE-2020-17470
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.021 (80.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: +0.000
Affected products
Weakness classification (CWE)
References
- www.kb.cert.org/vuls/id/815128 (US Government Resource, Third Party Advisory)
- us-cert.cisa.gov/ics/advisories/icsa-20-343-01 (US Government Resource, Third Party Advisory)
- fnet.sourceforge.net/manual/fnet_history.html (Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2020-17470?
- CVE-2020-17470 is a medium-severity vulnerability in Butok Fnet, classified under Use of Insufficiently Random Values. CVSS score: 5.3/10. Published 2020-12-11.
- How severe is CVE-2020-17470?
- Medium severity. CVSS v3 base score is 5.3 out of 10.