CVE-2020-17467

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
47(Track)
EG Risk 47/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
86.1%
KEV
Not listed

Published

December 11, 2020

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Jul 19, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa, cert.
cert

VU#815128 - Embedded TCP/IP stacks have memory corruption vulnerabilities

https://www.kb.cert.org/vuls/id/815128
cisa Patch Available🔴 Active Exploitation

Multiple Embedded TCP/IP Stacks | CISA

Multiple Embedded TCP/IP Stacks | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

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

Embedded TCP/IP stack: FNET Change Log

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

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-24 14:14 UTCEPSS rescore
  2. 2026-07-23 14:15 UTCEPSS rescore
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  4. 2026-07-23 01:50 UTCEG score recompute
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  20. 2026-07-12 22:07 UTCOSV refresh
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  20. 2026-06-24 07:50 UTCOSV refresh
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  47. 2026-06-07 11:29 UTCOSV refresh
  48. 2026-06-06 13:45 UTCEPSS rescore
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  70. 2026-05-26 07:17 UTCEPSS rescore
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  72. 2026-05-24 16:48 UTCEPSS rescore
  73. 2026-05-23 04:19 UTCEG score recompute
  74. 2026-05-23 04:19 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2020-17467?
CVE-2020-17467 is a critical vulnerability published on December 11, 2020. 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 fnetllmnrpoll…
When was CVE-2020-17467 disclosed?
CVE-2020-17467 was first published in the National Vulnerability Database on December 11, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-17467 actively exploited?
CVE-2020-17467 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 86.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-17467?
CVE-2020-17467 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2020-17467?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-17467, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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