vciy

CVE-2020-1350

INDEX BUILT · 2026-09-20

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A remote code execution vulnerability exists in Windows Domain Name System servers when they fail to properly handle requests, aka 'Windows DNS…

CVE-2020-13504 of 4 sources documented this
75

rank 75 = 40 + 25 + 0 + 4 + 6

rank@v1 · act now

Someone is already using it

CISA KEV catalog · public proof-of-concept · FIRST EPSS

EPSS 0.91353 · CISA KEV listed  ·  without this subject the record ranks 35

What it costs you if it fires

NVD CVSS base score, then the CNA's own

CVSS 10.0, from NVD  ·  without this subject the record ranks 50

It is getting worse, not staying still

FIRST EPSS series, rescorings and bad loads removed

no persisting rise in 365 days  ·  without this subject the record ranks 75

How much of the world it touches

NVD CPE configurations

2 products in the CPE ranges  ·  without this subject the record ranks 71

Someone else already set the date

CISA KEV remediation due date

CISA remediation date held  ·  without this subject the record ranks 69

Unaudited dollar value2 of 3 inputs carry a receipt
Exposure$4.56Mover the next 30 days, if this record is yours
Movement+$325,000on 2025-02-08, the last material move, 1 year, 6 months before this reading
Basisassumeda published average, not your estate

$4.56M = $4.99M incident cost x 1 exposure x 0.91353 likelihood

udv@v1 · unaudited · wrong for you until you say what you run

$4.99M is the cost of a breach that happened, from IBM Cost of a Data Breach Report 2026, global average. It is not the value of any asset of yours. That average already covers breaches of every severity, so scaling it by exposure understates a partial-impact record. That is an assumption, not a measurement. Your own asset value goes in the decision record.

Hindsight · the state

0.91353EPSSKEV · LISTED
Severity10 CRITICALreceipt
Harmtotal loss · unauthenticatedreceipt
Exploitationin the wild · KEVreceipt
Defenseno fix version held
Movementrisenreceipt
PLATEAU10Minimal movement since 2023-03-07, 1277 days at 0.91, as of 2026-09-04. arc-rules@v1

Foresight · where to check next

Palo AltoAtlassianApache Log4j2MicrosoftUbiquiti IncCisco Secure1350

This record is one instance of CWE-20, improper input validation. The index holds 13347 prior instances of this class, 73 KEV-listed. The nearest of its KEV-listed records are drawn beside this. taxonomy@v1

Full pattern panel

Prior records in this weakness class. Each is its own record, dated and receipted.
Color is a claim, not decoration:the hostile worldthe defenseno signalspoke length is how much of the record matches, not how bad it is

Running Microsoft Windows Server? Check your version

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AcceptDeferPatch by…Not affectedMitigated

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Harm, if it fires from the vector and the weakness

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Reachnetwork-reachable · no privileges required · no user interaction · low attack complexityreceipt
ImpactComplete confidentiality, integrity and availability loss, with impact beyond the vulnerable componentreceipt
Scored fromCVSS v3.1 · NVD's vectorreceipt
Weakness classCWE-20 Improper Input Validationreceipt
Published consequencesCWE-20: Availability: DoS: Crash, Exit, or Restart, DoS: Resource Consumption (CPU), DoS: Resource Consumption (Memory); Confidentiality: Read Memory, Read Files or Directories…[email protected]
Ransomware campaign useUnknown to CISAreceipt

CISA KEV & Federal Remediation Deadline from the record and CISA

The fix, and how long it's been waiting.

Fixed inNo fix version in held sources, as the index stood on 4 Sep 2026.
Patch available sinceNo dated patch-availability record in held sources. The index holds reference URLs without dates and only the current revision of the CVE record, so the day a fix first existed cannot be derived. Only the versions it landed in.
CISA remediation statusoverdue since 2022-05-03receipt
CISA required actionApply updates per vendor instructions.receipt
Published to CISA KEV477 daysderived

Exploit Status & Known PoCs a ladder, not a score

Current rung: Exploited in the wild · CISA KEV listed, 2021-11-03.

  • RUNG 1Nothing observed in held sources
  • RUNG 2Proof-of-concept published · 15 public repositories2020-03-11receipt
  • RUNG 3Exploited in the wild · CISA KEV listed2021-11-03receipt
  • RUNG 4Ransomware campaign use known

Authority who says so

CVSS, NVD10 CRITICALreceipt
Exploit probability0.91353 · top 0.19% of all CVEsreceipt
Blast breadth1 product across 1 vendorderived
Assigned bymicrosoftreceipt
Recorded changes76 · last 18 Sep 2026derived

Affected & Fixed Versions as published

Affected productMicrosoft Windows Server; Microsoft Windows Server, version 1909 (Server Core installation); Microsoft Windows Server, version 1903 (Server Core installation)…receipt
Published rangesmicrosoft windows server 2008 r2; microsoft windows server 2012 r2receipt

A rung lights from a row in the index, never from an assessment. "Held sources" is the true scope of the claim: this index reads the CVE record, NVD, CISA KEV, FIRST's EPSS and public proof-of-concept repositories, and it does not observe attacks.

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What it is stated by the CNA

A remote code execution vulnerability exists in Windows Domain Name System servers when they fail to properly handle requests, aka 'Windows DNS Server Remote Code Execution Vulnerability'. receipt

NVD's analysis a second authority

severity
10 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
weakness
CWE-20
affected versions
microsoft windows server 2008 r2; microsoft windows server 2012 r2
also scored by
10 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

check it yourself portal.msrc.microsoft.com packetstormsecurity.com receipt

Dated events

2021-11-03Added to CISA KEV2022-02-04EPSS moved 0.42 to 0.502022-05-03CISA remediation due2023-03-07EPSS moved 0.50 to 0.932025-02-08EPSS moved 0.84 to 0.90

Movement the material steps

14 Apr 20210.41682
7 Mar 20230.92802 · crossed 0.50 and 0.90 · scoring model v2023.03.01
17 Dec 20240.83648 · crossed 0.90
8 Feb 20250.90161 · crossed 0.90
17 Mar 20250.93577 · scoring model v2025.03.14
15 Jun 20260.92178 · scoring model v2026.06.15
1 Aug 20260.91353
Show all 62 observations
14 Apr 20210.41682
4 Feb 20220.49632
7 Mar 20230.92802
17 Mar 20230.92463
30 Mar 20230.91873
25 Apr 20230.92976
8 May 20230.93561
10 May 20230.92805
20 Jun 20230.93425
3 Jul 20230.94286
8 Jul 20230.93812
15 Sep 20230.94472
16 Oct 20230.94241
2 Dec 20230.93986
9 Feb 20240.94337
13 Mar 20240.94458
3 May 20240.94441
23 Aug 20240.94619
8 Sep 20240.94399
25 Nov 20240.93570
17 Dec 20240.83648
8 Feb 20250.90161
17 Mar 20250.93577
19 Mar 20250.93706
20 Mar 20250.93577
27 Mar 20250.93706
28 Mar 20250.93577
29 Mar 20250.93706
30 Mar 20250.93577
15 Jun 20250.93595
18 Jun 20250.93577
25 Jun 20250.93595
7 Jul 20250.93577
17 Jul 20250.93595
30 Jul 20250.93577
8 Sep 20250.93292
16 Sep 20250.93316
24 Sep 20250.93292
1 Oct 20250.9319
4 Oct 20250.93292
17 Oct 20250.93249
22 Oct 20250.93271
24 Oct 20250.93363
1 Nov 20250.93267
4 Nov 20250.9334
12 Nov 20250.93808
13 Nov 20250.93822
18 Nov 20250.93301
21 Nov 20250.93822
30 Nov 20250.93808
21 Dec 20250.93822
3 Jan 20260.93808
18 Jan 20260.93822
5 Feb 20260.93808
21 Mar 20260.93822
7 Apr 20260.93808
21 Apr 20260.93822
11 May 20260.93808
22 May 20260.93822
4 Jun 20260.93808
15 Jun 20260.92178
1 Aug 20260.91353

62 observations held. A highlighted step crossed a promotion threshold. A step marked with a scoring model moved because the instrument was replaced, not because the vulnerability changed. receipt

The full biography

EPSS 0.91353Public PoC2020-03-11Published2020-07-14CISA KEV2021-11-03Index as of2026-09-04

Listed by CISA 477 days after it published and the record had been public for 6 years, 1 month when this index was last written.

No material movement in 34 days as of the last ingest this index recorded.

Public PoC 2020-03-11 receipt · Published 2020-07-14 receipt · CISA KEV 2021-11-03 receipt · Index as of 2026-09-04 derived

The pattern, elsewhere

This record is one instance of CWE-20, improper input validation. The index holds 13347 prior instances of this class, 73 KEV-listed. The nearest of its KEV-listed records are drawn beside this. [email protected]

CVE-2024-3400 · Palo Alto Networks PAN-OSmatches 8 of 9KEV listed · 2024receipt
CVE-2023-22515 · Atlassian Confluence Data Centermatches 8 of 9KEV listed · 2023receipt
CVE-2021-44228 · Apache Log4j2matches 8 of 9KEV listed · 2021receipt
CVE-2019-0604 · Microsoft SharePoint Servermatches 8 of 9KEV listed · 2019receipt
CVE-2026-34910 · Ubiquiti Inc UniFi OS Servermatches 8 of 9KEV listed · 2026receipt
CVE-2025-20393 · Cisco Secure Emailmatches 8 of 9KEV listed · 2025receipt

"Matches n of m" counts the attributes the two records can both be compared on: the CVSS metrics they share a version of, any weakness class beyond this one, and the vendor. fit-rules@v1

13347 records in this class held. The six above are drawn from the ones CISA has listed as exploited, ranked by how much of the record matches this one. That is why every one of them is KEV-listed: the pool is, so the colour on those spokes says nothing the pool has not already said.

No curated product neighbourhood is held for this product, so the records above are the nearest this index can name. The neighbourhood table covers a small set of products and is extended by hand.

Siblings and hubs

Records related to this one

Its defect family

microsoft windows server

Of the 23 records in this family, this is the only one holding a CISA KEV listing: Microsoft Windows DNS Server Remote Code Execution Vulnerabi.

Grouped by shared product and weakness, not by shared vulnerability. Each record's own state is on its own page.

Family membership: computed, pro@dim2000

This record is one of a group, and the group's page describes all of them. This page is kept and dated, and the defect family's own page is the one we offer for indexing: the whole group.

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What usually comes next

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