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CVE-2020-17467

23
FAUCET Score

CVE-2020-17467 is a critical information disclosure vulnerability affecting FNET versions up to 4.6.4, specifically within the butok fnet product. The flaw stems from improper handling of hostname termination in LLMNR requests, leading to incorrect length calculations and potential data exposure during malicious DNS class IN requests. With a CVSS score of 9.1 (Critical), this vulnerability has a network-based attack vector, low attack complexity, and can result in high confidentiality and availability impacts. While no active exploitation, public exploit code, or significant community discussion has been observed, its high FAUCET Risk Score indicates a notable potential for impact.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.6.4CPE matchmatch criteria
cpe:2.3:a:butok:fnet:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.04%
Probability of exploitation in next 30 days
EPSS Percentile
86.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0304 is in the 77th percentile among its peer group of 36,835 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

fnet.sourceforge.net / manual/fnet_history.html
Release NotesThird Party Advisory
us-cert.cisa.gov / ics/advisories/icsa-20-343-01
Third Party AdvisoryUS Government Resource
kb.cert.org / vuls/id/815128
Third Party AdvisoryUS Government Resource