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Full vulnerability report · 2020
CVE-2020-16952High confidence

Microsoft SharePoint Remote Code Execution Vulnerability

Microsoft · Microsoft SharePoint Enterprise Server 2016

8.6HighCVSS 3.1
Recommended action
Within 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Critical, raised one band.upgradedsince 4 Aug 2024

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 71.09% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Microsoft Microsoft SharePoint Enterprise Server 2016 and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Optional official sources

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

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2020-8910

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

<p>A remote code execution vulnerability exists in Microsoft SharePoint when the software fails to check the source markup of an application package. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the SharePoint application pool and the SharePoint server farm account.</p> <p>Exploitation of this vulnerability requires that a user uploads a specially crafted SharePoint application package to an affected version of SharePoint.</p> <p>The security update addresses the vulnerability by correcting how SharePoint checks the source markup of application packages.</p>

What

<p>A remote code execution vulnerability exists in Microsoft SharePoint when the software fails to check the source markup of an application package. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the SharePoint application pool and the SharePoint server farm account.</p> <p>Exploitation of this vulnerability requires that a user uploads a specially crafted SharePoint application package to an affected version of SharePoint.</p> <p>The security update addresses the vulnerability by correcting how SharePoint checks the source markup of application packages.</p>

Why

The product does not properly verify that the source of data or communication is valid.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

What

<p>A remote code execution vulnerability exists in Microsoft SharePoint when the software fails to check the source markup of an application package. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the SharePoint application pool and the SharePoint server farm account.</p> <p>Exploitation of this vulnerability requires that a user uploads a specially crafted SharePoint application package to an affected version of SharePoint.</p> <p>The security update addresses the vulnerability by correcting how SharePoint checks the source markup of application packages.</p>

Why

The product does not properly verify that the source of data or communication is valid.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

02

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.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Origin Validation Error → execute code or commands in the affected security context
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-346 ↗

CWE-346: Origin Validation Error. The product does not properly verify that the source of data or communication is valid.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L/E:P/RL:O/RC:C

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.IHighIntegrity impact: A successful attack can cause a major loss.ALowAvailability impact: A successful attack can cause a limited 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.
NetworkUnauthenticatedRemote code executionCWE-346Public exploit reference
A

Official authority intelligence

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

Cyber Security Agency of Singapore · English · CSA-SB-20201021Security Bulletin 21 Oct 2020

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 21 Oct 2020, published on 21 October 2020. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-633Multiples vulnérabilités dans Microsoft Office

d?id=CVE-2020-16942 Référence CVE CVE-2020-16944 https://www.cve.org/CVERecord?id=CVE-2020-16944 Référence CVE CVE-2020-16945 https://www.cve.org/CVERecord?id=CVE-2020-16945 Référence CVE CVE-2020-16946 https://www.cve.org/CVERecord?id=CVE-2020-16946 Référence CVE CVE-2020-16947 https://www.cve.org/CVERecord?id=CVE-2020-16947 Référence CVE CVE-2020-16948 https://www.cve.org/CVERecord?id=CVE-2020-16948 Référence CVE CVE-2020-16949 https://www.cve.org/CVERecord?id=CVE-2020-16949 Référence CVE CVE-2020-16950 https://www.cve.org/CVERecord?id=CVE-2020-16950 Référence CVE CVE-2020-16951 https://www.cve.org/CVERecord?id=CVE-2020-16951 Référence CVE CVE-2020-16952 https://www.cve.org/CVERecord?id=CVE-2020-16952 Référence CVE CVE-2020-16953 https://www.cve.org/CVERecord?id=CVE-2020-16953 Référence CVE CVE-2020-16954 https://www.cve.org/CVERecord?id=CVE-2020-16954 Référence CVE CVE-2020-16955 https://www.cve.org/CVERecord?id=CVE-2020-16955 Référence CVE CVE-2020-16957 https://www.cve.org/CVERecord?id=CVE-2020-16957 Gestion détaillée du document le 14 octobre 2020 Version initiale Alertes Avis Bulletins d’actualités Mentions légales Conditions générales À propos Contact cyber.gouv.fr service-public.fr legifrance.gouv.fr info.gouv.fr france.fr info.gouv.fr/risques Premier Ministre / Secrétariat Général de

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2020-009968複数の Microsoft SharePoint 製品におけるリモートでコードを実行される脆弱性

Microsoft SharePoint Enterprise Server、SharePoint Foundation、SharePoint Server には、ソフトウェアがアプリケーションパッケージのソースマークアップのチェックに失敗した場合、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「Microsoft SharePoint のリモート 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-2020-16951 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2020-009967複数の Microsoft SharePoint 製品におけるリモートでコードを実行される脆弱性

Microsoft SharePoint Enterprise Server、SharePoint Foundation、SharePoint Server には、ソフトウェアがアプリケーションパッケージのソースマークアップのチェックに失敗した場合、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「Microsoft SharePoint のリモート 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-2020-16952 とは異なる脆弱性です。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5208MS 10월 보안 위협에 따른 정기 보안 업데이트 권고

실행 취약점(CVE-2020-16929, CVE-2020-16930, CVE-2020-16931, CVE-2020-16932, CVE-2020-16947, CVE-2020-16954, CVE-2020-16957) - 권한상승 취약점(CVE-2020-16928, CVE-2020-16934, CVE-2020-16955) - 서비스 거부 취약점(CVE-2020-16949) - 보안 기능 우회 취약점(CVE-2020-16933) o 영향 : 원격코드실행 o 중요도 : 긴급 o 관련 KB번호 - 4462175, 4484417, 4484435, 4484524, 4486663, 4486671, 4486674, 4486678, 4486679, 4486682, 4486688, 4486689, 4486692, 4486695, 4486700, 4486701, 4486703, 4486707 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 5. Microsoft SharePoint 관련 소프트웨어 보안 업데이트 ##### □ 설명 o 공격자가 특수하게 제작된 악성 응용 프로그램을 실행할 경우, 원격코드실행을 허용하는 취약점 o 관련취약점 : - 원격코드실행 취약점(CVE-2020-16929, CVE-2020-16951, CVE-2020-16952) - 정보노출 취약점(CVE-2020-16941, CVE-2020-16942, CVE-2020-16948, CVE-2020-16950, CVE-2020-16953) - 스푸핑(CVE-2020-16944, CVE-2020-16945, CVE-2020-16946) o 영향 : 원격코드실행 o 중요도 : 긴급 o 관련 KB번호 - 4484531, 4486676, 4486677, 4486687, 4486694, 4486708 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 6. Microsoft Exchange 관련 소프트웨어 보안 업데이트 ##### □ 설명 o 공격자가 프로그램의 미흡한 설계(적절한 검증 부재)를 악용하여 제한된 자원에 접근가능한 정보노출 취약점 o 관련취약점 : - 정보노출 취약점(CVE-2020-16969) o 영향 : 정보노출 o 중요도 : 중요 o 관련 KB번호 - 4581424 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 7. Microsoft Dynamics 365 보안 업데이트 ##### □ 설명 o 공격자가 특수하게 제작된 악성 응용 프로그램을 실행할 경우, 스푸핑을 허용하여 발생하는 권한상승 취약점 o 관련취약점 :

Official advisory ↗
03

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
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. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 16 Oct 2020 · Last source change 4 Aug 2024, 13:45 UTC · CWE-346 · Origin Validation Error

CVE recordCVE.org · 5.1
CVSS sourceCNA
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-2020-8910
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.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2020-8910↗CVE authority or vendor reference↗Public exploit 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.
Free version - for non-commercial use only.CVE-2020-16952 · cve.blacktree.nl