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Full vulnerability report · 2020
CVE-2020-1577High confidence

DirectWrite Information Disclosure Vulnerability

Microsoft · Windows 10 Version 2004

7.8HighCVSS 3.1
Recommended action
Within 7 days

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

Patch available
Optional official sources

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

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

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-2020-12450

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; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

An information disclosure vulnerability exists when DirectWrite improperly discloses the contents of its memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user’s system. There are multiple ways an attacker could exploit the vulnerability, such as by convincing a user to open a specially crafted document, or by convincing a user to visit an untrusted webpage. The security update addresses the vulnerability by correcting how DirectWrite handles objects in memory.

What

An information disclosure vulnerability exists when DirectWrite improperly discloses the contents of its memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user’s system. There are multiple ways an attacker could exploit the vulnerability, such as by convincing a user to open a specially crafted document, or by convincing a user to visit an untrusted webpage. The security update addresses the vulnerability by correcting how DirectWrite handles objects in memory.

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may obtain information outside the intended access boundary.

What

An information disclosure vulnerability exists when DirectWrite improperly discloses the contents of its memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user’s system. There are multiple ways an attacker could exploit the vulnerability, such as by convincing a user to open a specially crafted document, or by convincing a user to visit an untrusted webpage. The security update addresses the vulnerability by correcting how DirectWrite handles objects in memory.

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may obtain information outside the intended access boundary.

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.
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
local access → vulnerable operation → obtain information outside the intended access boundary
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
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.
CWE not yet assigned
CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

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

AVLocalAttack vector: The attacker needs local access to the vulnerable system.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.SUnchangedScope: The security impact remains within the vulnerable component's 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
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
A

Official authority intelligence

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

CERT-FR · French · CERTFR-2020-AVI-501Multiples vulnérabilités dans Microsoft Windows

.cve.org/CVERecord?id=CVE-2020-1558 Référence CVE CVE-2020-1560 https://www.cve.org/CVERecord?id=CVE-2020-1560 Référence CVE CVE-2020-1561 https://www.cve.org/CVERecord?id=CVE-2020-1561 Référence CVE CVE-2020-1562 https://www.cve.org/CVERecord?id=CVE-2020-1562 Référence CVE CVE-2020-1564 https://www.cve.org/CVERecord?id=CVE-2020-1564 Référence CVE CVE-2020-1565 https://www.cve.org/CVERecord?id=CVE-2020-1565 Référence CVE CVE-2020-1566 https://www.cve.org/CVERecord?id=CVE-2020-1566 Référence CVE CVE-2020-1571 https://www.cve.org/CVERecord?id=CVE-2020-1571 Référence CVE CVE-2020-1574 https://www.cve.org/CVERecord?id=CVE-2020-1574 Référence CVE CVE-2020-1577 https://www.cve.org/CVERecord?id=CVE-2020-1577 Référence CVE CVE-2020-1578 https://www.cve.org/CVERecord?id=CVE-2020-1578 Référence CVE CVE-2020-1579 https://www.cve.org/CVERecord?id=CVE-2020-1579 Référence CVE CVE-2020-1584 https://www.cve.org/CVERecord?id=CVE-2020-1584 Référence CVE CVE-2020-1585 https://www.cve.org/CVERecord?id=CVE-2020-1585 Référence CVE CVE-2020-1587 https://www.cve.org/CVERecord?id=CVE-2020-1587 Gestion détaillée du document le 12 août 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

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
Windows 10 Version 2004: 10.0.0 < publication; Windows Server version 2004: 10.0.0 < publication; Windows 10 Version 1803: 10.0.0 < publication; Windows 10 Version 1809: 10.0.0 < publication; Windows Server 2019: 10.0.0 < publication; Windows Server 2019 (Server Core installation): 10.0.0 < publication; Windows 10 Version 1909: 10.0.0 < publication; Windows Server, version 1909 (Server Core installation): 10.0.0 < publication; Windows 10 Version 1709 for 32-bit Systems: 10.0.0 < publication; Windows 10 Version 1709: 10.0.0 < publication; Windows 10 Version 1903 for 32-bit Systems: 10.0.0 < publication; Windows 10 Version 1903 for x64-based Systems: 10.0.0 < publication; Windows 10 Version 1903 for ARM64-based Systems: 10.0.0 < publication; Windows Server, version 1903 (Server Core installation): 10.0.0 < publication; Windows 10 Version 1507: 10.0.0 < publication; Windows 10 Version 1607: 10.0.0 < publication; Windows Server 2016: 10.0.0 < publication; Windows Server 2016 (Server Core installation): 10.0.0 < publication; Windows 7: 6.1.0 < publication; Windows 7 Service Pack 1: 6.1.0 < publication; Windows 8.1: 6.3.0 < publication; Windows Server 2008 Service Pack 2: 6.0.0 < publication; Windows Server 2008 Service Pack 2 (Server Core installation): 6.0.0 < publication; Windows Server 2008 Service Pack 2: 6.0.0 < publication; Windows Server 2008 R2 Service Pack 1: 6.1.0 < publication; Windows Server 2008 R2 Service Pack 1 (Server Core installation): 6.0.0 < publication; Windows Server 2012: 6.2.0 < publication; Windows Server 2012 (Server Core installation): 6.2.0 < publication; Windows Server 2012 R2: 6.3.0 < publication; Windows Server 2012 R2 (Server Core installation): 6.3.0 < publication
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.
04

Evidence and provenance

Published 17 Aug 2020 · Last source change 1 Oct 2024, 15:57 UTC · CWE not yet assigned

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-2020-12450
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceUnavailable
NVD statusNVD modified after enrichment

Missing structured fields: CWE classification. Missing data is not evidence of low risk; review the primary advisory.

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
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-2020-1577 · cve.blacktree.nl