Out-of-bounds Read in Butok Fnet
CVE-2020-17467
An issue was discovered in FNET through 4.6.4. The code for processing the hostname from an LLMNR request doesn't check for '\0' termination. Therefore, the deduced length of the hostname doesn't reflect the correct length of the actual data. This may lead to Information Disclosure in _fnet_llmnr_poll in fnet_llmnr.c during a response to a malicious request of the DNS class IN.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
EPSS exploit prediction
EPSS: 0.031 (87.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.030 · newest: 0.031 · 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-2020-17467?
- CVE-2020-17467 is a critical-severity vulnerability in Butok Fnet, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2020-12-11.
- How severe is CVE-2020-17467?
- Critical severity. CVSS v3 base score is 9.1 out of 10.