CVE-2020-16898

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 11%CVSS: 8.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

A remote code execution vulnerability exists when the Windows TCP/IP stack improperly handles ICMPv6 Router Advertisement packets. An attacker who successfully exploited this vulnerability could gain the ability to execute code on the target server or client. To exploit this vulnerability, an attacker would have to send specially crafted ICMPv6 Router Advertisement packets to a remote Windows computer. The update addresses the vulnerability by correcting how the Windows TCP/IP stack handles ICMPv6 Router Advertisement packets.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
60
EG Risk 60/100CISA SSVC

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
Severity88% × 45%
Exploitation40% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
11%
EPSS %ILE
95th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 16, 2020

Last Modified

February 23, 2026

Advisory Details (1)

Auto-updated Aug 24, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16898

Vendor Advisories for CVE-2020-16898(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 6× in last 7d / 28× 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.

Showing the most recent 100 of 157 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-04 23:18 UTCEPSS rescore
  3. 2026-10-03 14:22 UTCEPSS rescore
  4. 2026-10-02 16:22 UTCEPSS rescore
  5. 2026-09-30 15:13 UTCEG score recompute
  6. 2026-09-30 14:59 UTCEPSS rescore
  7. 2026-09-27 13:40 UTCEPSS rescore
  8. 2026-09-26 15:54 UTCEPSS rescore
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  1. 2026-09-08 21:56 UTCEPSS rescore
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  9. 2026-08-30 19:14 UTCEPSS rescore
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  11. 2026-08-27 14:21 UTCEPSS rescore
  12. 2026-08-26 14:42 UTCEPSS rescore
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  20. 2026-08-16 02:11 UTCEPSS rescore
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  22. 2026-08-13 21:57 UTCEPSS rescore
  23. 2026-08-12 13:47 UTCEPSS rescore
  24. 2026-08-09 13:43 UTCEPSS rescore
  25. 2026-08-08 16:33 UTCEPSS rescore
  26. 2026-08-07 16:23 UTCEPSS rescore
  27. 2026-08-06 13:43 UTCEPSS rescore
  28. 2026-08-05 19:14 UTCEPSS rescore
  29. 2026-08-04 15:06 UTCEPSS rescore
  30. 2026-08-04 10:34 UTCEPSS rescore
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  41. 2026-07-23 01:50 UTCEG score recompute
  42. 2026-07-22 22:35 UTCEG score recompute
  43. 2026-07-22 14:05 UTCEPSS rescore
  44. 2026-07-21 15:22 UTCEPSS rescore
  45. 2026-07-21 15:22 UTCEPSS rescore
  46. 2026-07-20 17:04 UTCEPSS rescore
  47. 2026-07-20 17:04 UTCEPSS rescore
  48. 2026-07-19 14:28 UTCEPSS rescore
  49. 2026-07-19 02:26 UTCEPSS rescore
  50. 2026-07-19 02:26 UTCEPSS rescore
  51. 2026-07-18 10:02 UTCEPSS rescore
  52. 2026-07-16 16:59 UTCEPSS rescore
  53. 2026-07-15 16:55 UTCEPSS rescore
  54. 2026-07-15 01:57 UTCEPSS rescore
  55. 2026-07-13 22:27 UTCEPSS rescore
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  62. 2026-07-09 19:07 UTCEPSS rescore
  63. 2026-07-08 15:12 UTCEPSS rescore
  64. 2026-07-07 13:43 UTCEPSS rescore
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  66. 2026-07-06 16:25 UTCEPSS rescore
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  68. 2026-07-06 02:21 UTCEPSS rescore
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  71. 2026-07-04 06:29 UTCEPSS rescore
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  73. 2026-07-01 15:03 UTCEPSS rescore
  74. 2026-06-30 23:20 UTCEPSS rescore
  75. 2026-06-30 23:20 UTCEPSS rescore

Publicly available exploits

(10 references)

Working exploit code is in the public domain (10 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCkomomon/CVE-2020-16898--EXP-POC
    First seen Oct 28, 2020

    CVE-2020-16898 Windows TCP/IP远程代码执行漏洞 EXP&POC

    Open source ↗
  • GitHub PoCkomomon/CVE-2020-16898-EXP-POC
    First seen Oct 20, 2020

    CVE-2020-16898 Windows TCP/IP远程代码执行漏洞 EXP&POC

    Open source ↗
  • GitHub PoCjiansiting/cve-2020-16898
    First seen Oct 17, 2020

    PoC BSOD for CVE-2020-16898

    Open source ↗
  • GitHub PoCmomika233/CVE-2020-16898-exp
    First seen Oct 17, 2020
    Open source ↗
  • GitHub PoC0xeb-bp/cve-2020-16898
    First seen Oct 16, 2020

    PoC BSOD for CVE-2020-16898 (badneighbor)

    Open source ↗
  • GitHub PoCcorelight/CVE-2020-16898
    First seen Oct 14, 2020

    A network detection package for CVE-2020-16898 (Windows TCP/IP Remote Code Execution Vulnerability)

    Open source ↗
  • GitHub PoCinitconf/CVE-2020-16898-Bad-Neighbor
    First seen Oct 14, 2020

    Zeek detection for CVE-2020-16898-"Bad Neighbor"

    Open source ↗
  • GitHub PoCMaliek/CVE-2020-16898_Check
    First seen Oct 14, 2020

    Minor powershell script that checks for vulnerable interfaces.

    Open source ↗
  • GitHub PoCZephrFish/CVE-2020-16898
    First seen Oct 14, 2020

    HoneyPoC 2.0: Proof-of-Concept (PoC) script to exploit IPv6 (CVE-2020-16898).

    Open source ↗
  • GitHub PoCadvanced-threat-research/CVE-2020-16898
    First seen Oct 7, 2020

    CVE-2020-16898 (Bad Neighbor) Microsoft Windows TCP/IP Vulnerability Detection Logic and Rule

    Open source ↗

Frequently asked(5)

What is CVE-2020-16898?
CVE-2020-16898 is a high vulnerability published on October 16, 2020. <p>A remote code execution vulnerability exists when the Windows TCP/IP stack improperly handles ICMPv6 Router Advertisement packets. An attacker who successfully exploited this vulnerability could gain the ability to execute code on the target server or client.</p> <p>To exploit this…
When was CVE-2020-16898 disclosed?
CVE-2020-16898 was first published on October 16, 2020, with the most recent update on February 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-16898 actively exploited?
CVE-2020-16898 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11% probability of exploitation in the next 30 days (95th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-16898?
CVE-2020-16898 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2020-16898?
A fix for CVE-2020-16898 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2020-16898 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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