CVE-2020-1043: Microsoft Windows Server — Improper Input Validation

Recommended actionWithin 7 days

Critical technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available

What, why and how

A remote code execution vulnerability exists when Hyper-V RemoteFX vGPU on a host server fails to properly validate input from an authenticated user on a guest operating system, aka 'Hyper-V RemoteFX vGPU Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-1032, CVE-2020-1036, CVE-2020-1040, CVE-2020-1041, CVE-2020-1042.

What

Why

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How

An attacker operating through the affected interface may attempt exploitation with low privileges. If successful, the issue may execute code or commands in the affected security context.

What

Why

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How

An attacker operating through the affected interface may attempt exploitation with low privileges. If successful, the issue may execute code or commands in the affected security context.

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path: the affected interface → Improper Input Validation → execute code or commands in the affected security context
Attack surface: Unspecified
Privileges required: Low: a basic authenticated account is required
User interaction: None
Attack complexity: Low: no specialised conditions are recorded
Security boundary: Changed: exploitation can affect a different security authority
Weakness ? CWE means Common Weakness Enumeration: a standard category for the underlying weakness.: CWE-20 ↗
CWE-20: Improper Input Validation. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
CVSS vector ? CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVAdjacentAttack vector: The attacker must be on an adjacent or logically close network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SChangedScope: The attack can affect a component governed by a different security authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land: After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.

Remote code executionCWE-20

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2020-11937Official EUVD mapping

0 linked advisory records.

Official EUVD record ↗

Cyber Security Agency of Singapore · English · CSA-SB-20200715Security Bulletin 15 Jul 2020

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 15 Jul 2020, published on 15 July 2020. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗

CERT-FR · French · CERTFR-2020-AVI-429Multiples vulnérabilités dans Microsoft Windows

de code à distance. Solution Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation). Documentation Bulletin de sécurité Microsoft du 14 juillet 2020 https://portal.msrc.microsoft.com/fr-FR/security-guidance Référence CVE CVE-2020-1032 https://www.cve.org/CVERecord?id=CVE-2020-1032 Référence CVE CVE-2020-1036 https://www.cve.org/CVERecord?id=CVE-2020-1036 Référence CVE CVE-2020-1040 https://www.cve.org/CVERecord?id=CVE-2020-1040 Référence CVE CVE-2020-1041 https://www.cve.org/CVERecord?id=CVE-2020-1041 Référence CVE CVE-2020-1042 https://www.cve.org/CVERecord?id=CVE-2020-1042 Référence CVE CVE-2020-1043 https://www.cve.org/CVERecord?id=CVE-2020-1043 Référence CVE CVE-2020-1085 https://www.cve.org/CVERecord?id=CVE-2020-1085 Référence CVE CVE-2020-1249 https://www.cve.org/CVERecord?id=CVE-2020-1249 Référence CVE CVE-2020-1267 https://www.cve.org/CVERecord?id=CVE-2020-1267 Référence CVE CVE-2020-1330 https://www.cve.org/CVERecord?id=CVE-2020-1330 Référence CVE CVE-2020-1333 https://www.cve.org/CVERecord?id=CVE-2020-1333 Référence CVE CVE-2020-1336 https://www.cve.org/CVERecord?id=CVE-2020-1336 Référence CVE CVE-2020-1344 https://www.cve.org/CVERecord?id=CVE-2020-1344 Référence CVE CVE-2020-1346 https://www.cve.org/CVERecord?id=CVE-2020-1346 Ré

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2020-008161複数の Microsoft Windows 製品におけるリモートでコードを実行される脆弱性

Microsoft Windows Server 2008、Windows Server 2012、Windows Server 2016 には、ホストサーバー上の Hyper-V RemoteFX vGPU が、ゲストオペレーティングシステム上の認証されているユーザーからの入力を適切に検証しない場合、リモートでコードを実行される脆弱性が存在します。ベンダは、本脆弱性を「Hyper-V RemoteFX vGPU のリモートでコードが実行される脆弱性」として公開しています。本脆弱性は、CVE-2020-1032、CVE-2020-1036、CVE-2020-1040、CVE-2020-1042、CVE-2020-1043 とは異なる脆弱性です。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2020-008160複数の Microsoft Windows 製品におけるリモートでコードを実行される脆弱性

Microsoft Windows Server 2008、Windows Server 2012、Windows Server 2016 には、ホストサーバー上の Hyper-V RemoteFX vGPU が、ゲストオペレーティングシステム上の認証されているユーザーからの入力を適切に検証しない場合、リモートでコードを実行される脆弱性が存在します。ベンダは、本脆弱性を「Hyper-V RemoteFX vGPU のリモートでコードが実行される脆弱性」として公開しています。本脆弱性は、CVE-2020-1032、CVE-2020-1036、CVE-2020-1041、CVE-2020-1042、CVE-2020-1043 とは異なる脆弱性です。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2020-008159複数の Microsoft Windows 製品におけるリモートでコードを実行される脆弱性

Microsoft Windows Server 2008、Windows Server 2012、Windows Server 2016 には、ホストサーバー上の Hyper-V RemoteFX vGPU が、ゲストオペレーティングシステム上の認証されているユーザーからの入力を適切に検証しない場合、リモートでコードを実行される脆弱性が存在します。ベンダは、本脆弱性を「Hyper-V RemoteFX vGPU のリモートでコードが実行される脆弱性」として公開しています。本脆弱性は、CVE-2020-1032、CVE-2020-1040、CVE-2020-1041、CVE-2020-1042、CVE-2020-1043 とは異なる脆弱性です。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2020-008158複数の Microsoft Windows 製品におけるリモートでコードを実行される脆弱性

Microsoft Windows Server 2008、Windows Server 2012、Windows Server 2016 には、ホストサーバー上の Hyper-V RemoteFX vGPU が、ゲストオペレーティングシステム上の認証されているユーザーからの入力を適切に検証しない場合、リモートでコードを実行される脆弱性が存在します。ベンダは、本脆弱性を「Hyper-V RemoteFX vGPU のリモートでコードが実行される脆弱性」として公開しています。本脆弱性は、CVE-2020-1036、CVE-2020-1040、CVE-2020-1041、CVE-2020-1042、CVE-2020-1043 とは異なる脆弱性です。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2020-008155複数の Microsoft Windows 製品におけるリモートでコードを実行される脆弱性

Microsoft Windows Server 2008、Windows Server 2012、Windows Server 2016 には、ホストサーバー上の Hyper-V RemoteFX vGPU が、ゲストオペレーティングシステム上の認証されているユーザーからの入力を適切に検証しない場合、リモートでコードを実行される脆弱性が存在します。ベンダは、本脆弱性を「Hyper-V RemoteFX vGPU のリモートでコードが実行される脆弱性」として公開しています。本脆弱性は、CVE-2020-1032、CVE-2020-1036、CVE-2020-1040、CVE-2020-1041、CVE-2020-1042 とは異なる脆弱性です。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2020-008154複数の Microsoft Windows 製品におけるリモートでコードを実行される脆弱性

Microsoft Windows Server 2008、Windows Server 2012、Windows Server 2016 には、ホストサーバー上の Hyper-V RemoteFX vGPU が、ゲストオペレーティングシステム上の認証されているユーザーからの入力を適切に検証しない場合、リモートでコードを実行される脆弱性が存在します。ベンダは、本脆弱性を「Hyper-V RemoteFX vGPU のリモートでコードが実行される脆弱性」として公開しています。本脆弱性は、CVE-2020-1032、CVE-2020-1036、CVE-2020-1040、CVE-2020-1041、CVE-2020-1043 とは異なる脆弱性です。

Official advisory ↗

KISA KrCERT/CC · Korean · KNVD-5171MS 7월 보안 위협에 따른 정기 보안 업데이트 권고

CVE-2020-1361, CVE-2020-1367, CVE-2020-1386, CVE-2020-1389, CVE-2020-1391, CVE-2020-1397, CVE-2020-1419, CVE-2020-1420, CVE-2020-1426, CVE-2020-1433, CVE-2020-1462, CVE-2020-1468) o 영향 : 원격코드실행 o 중요도 : 긴급 o 관련 KB번호 - 4558997, 4558998, 4565483, 4565489, 4565503, 4565508, 4565511, 4565513, 4565552, 4565553, 4565554, 4565911, 4565912 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 2. Windows Server 2019, Windows Server 2016, Server Core 설치(2019, 2016, v1909, v1903, v1803) 보안 업데이트 ##### □ 설명 o 공격자가 특수하게 제작된 악성 응용 프로그램을 실행할 경우, 원격코드실행을 허용하는 취약점 o 관련취약점 : - 원격코드실행 취약점(CVE-2020-1032, CVE-2020-1036, CVE-2020-1040, CVE-2020-1041, CVE-2020-1042, CVE-2020-1043, CVE-2020-1350, CVE-2020-1355, CVE-2020-1374, CVE-2020-1400, CVE-2020-1401, CVE-2020-1407, CVE-2020-1408, CVE-2020-1409, CVE-2020-1410, CVE-2020-1412, CVE-2020-1421, CVE-2020-1435, CVE-2020-1436) - 권한상승 취약점(CVE-2020-1085, CVE-2020-1249, CVE-2020-1333, CVE-2020-1336, CVE-2020-1344, CVE-2020-1346, CVE-2020-1347, CVE-2020-1352, CVE-2020-1353, CVE-2020-1354, CVE-2020-1356, CVE-2020-1357, CVE-2020-1359, CVE-2020-1360, CVE-2020-1362, CVE-2020-1363, CVE-2020-1365, CVE-2020-1366, CVE-2020-1368, CVE-2020-1369, CVE-2020-1370, CVE-2020-1371, CVE-2020-1372, CVE-2020-1373, CVE-2020-1375, CVE-2020-1381, CVE-2020-1382, CVE-2020-1384, CVE-2020-1385, CVE-202

Official advisory ↗

Patch and workaround

Operational remediation based on structured source evidence.

Status ? Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.: Patch available
Affected: Windows Server: 2016, 2016 (Core installation), 2008 R2 for x64-based Systems Service Pack 1, 2008 R2 for x64-based Systems Service Pack 1 (Core installation), 2012, 2012 (Core installation), 2012 R2, 2012 R2 (Core installation)
Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action: Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround: No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.

Evidence and provenance

Published 14 Jul 2020 · Last source change 4 Aug 2024, 06:25 UTC · CWE-20 · Improper Input Validation

CVE recordCVE.org · 5.1

CVSS sourceNIST NVD

EPSS source

The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.

FIRST · tracked since 2026-08-14

European sourceENISA EUVD · EUVD-2020-11937

Product sourceCNA

Remediation sourceCVE/CNA references

CWE sourceNIST NVD

NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

2020-07-14CVE published

2024-08-04Fixed release or patch reference recorded

ENISA EUVD · EUVD-2020-11937↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗

Technical terms and abbreviations used in this report

CVE: Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS: Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS: Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE: Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA: CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP: Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD: National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT: A computer security incident response team that publishes warnings or coordinates incident response.
PoC: Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF: Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL: Living off the land: abuse of legitimate tools or system functions during an attack.

Microsoft Windows Server — Improper Input Validation

National CERT insights
?
CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

ENISA European Vulnerability Database

EUVD-2020-11937

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

What changed after publication

Microsoft Windows Server — Improper Input Validation

National CERT insights ?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

EUVD-2020-11937

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

National CERT insights
?
CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.