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Full vulnerability report · 2020
CVE-2020-1400High confidence

A remote code execution vulnerability exists when the Windows Jet Database Engine improperly handles objects in memory, aka 'Jet Database Engine Remote Code Execution Vulnerability'

Microsoft · Windows 10 Version 2004 for 32-bit Systems

7.8HighCVSS 3.1
Recommended action
Within 7 days

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

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 23.73% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Microsoft Windows 10 Version 2004 for 32-bit Systems 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 30 daysRemediation target: Within 180 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-2020-12276

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

A remote code execution vulnerability exists when the Windows Jet Database Engine improperly handles objects in memory, aka 'Jet Database Engine Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-1401, CVE-2020-1407.

What

A remote code execution vulnerability exists when the Windows Jet Database Engine improperly handles objects in memory, aka 'Jet Database Engine Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-1401, CVE-2020-1407.

Why

The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

How

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

What

A remote code execution vulnerability exists when the Windows Jet Database Engine improperly handles objects in memory, aka 'Jet Database Engine Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-1401, CVE-2020-1407.

Why

The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

How

An attacker operating through local access may attempt exploitation without authentication after a 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.
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 → Integer Underflow (Wrap or Wraparound) → execute code or commands in the affected security context
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
Required interaction required
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-191 ↗

CWE-191: Integer Underflow (Wrap or Wraparound). The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

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:N/UI:R/S:U/C:H/I:H/A:H

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.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.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
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.
UnauthenticatedRemote code executionCWE-191
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-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

.cve.org/CVERecord?id=CVE-2020-1391 Référence CVE CVE-2020-1392 https://www.cve.org/CVERecord?id=CVE-2020-1392 Référence CVE CVE-2020-1393 https://www.cve.org/CVERecord?id=CVE-2020-1393 Référence CVE CVE-2020-1394 https://www.cve.org/CVERecord?id=CVE-2020-1394 Référence CVE CVE-2020-1395 https://www.cve.org/CVERecord?id=CVE-2020-1395 Référence CVE CVE-2020-1396 https://www.cve.org/CVERecord?id=CVE-2020-1396 Référence CVE CVE-2020-1397 https://www.cve.org/CVERecord?id=CVE-2020-1397 Référence CVE CVE-2020-1398 https://www.cve.org/CVERecord?id=CVE-2020-1398 Référence CVE CVE-2020-1399 https://www.cve.org/CVERecord?id=CVE-2020-1399 Référence CVE CVE-2020-1400 https://www.cve.org/CVERecord?id=CVE-2020-1400 Référence CVE CVE-2020-1401 https://www.cve.org/CVERecord?id=CVE-2020-1401 Référence CVE CVE-2020-1402 https://www.cve.org/CVERecord?id=CVE-2020-1402 Référence CVE CVE-2020-1404 https://www.cve.org/CVERecord?id=CVE-2020-1404 Référence CVE CVE-2020-1405 https://www.cve.org/CVERecord?id=CVE-2020-1405 Référence CVE CVE-2020-1406 https://www.cve.org/CVERecord?id=CVE-2020-1406 Référence CVE CVE-2020-1407 https://www.cve.org/CVERecord?id=CVE-2020-1407 Référence CVE CVE-2020-1408 https://www.cve.org/CVERecord?id=CVE-2020-1408 Référence CVE CVE-2020-1409 https://www.cve.org/CVERecord?id=CVE-2020-1409 Ré

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2020-008121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

複数の Microsoft Windows 製品には、Windows Jet データベースエンジンがメモリ内のオブジェクトを適切に処理しない場合、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「Jet データベース エンジン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-2020-1400、CVE-2020-1401 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2020-008050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脆弱性

複数の Microsoft Windows 製品には、Windows Jet データベースエンジンがメモリ内のオブジェクトを適切に処理しない場合、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「Jet データベースエンジン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-2020-1400 および CVE-2020-1407 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2020-007883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脆弱性

複数の Microsoft Windows 製品には、Windows Jet データベースエンジンがメモリ内のオブジェクトを適切に処理しない場合、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「Jet データベース エンジン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-2020-1401 および CVE-2020-1407 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

- 원격코드실행 취약점(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)

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. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 14 Jul 2020 · Last source change 4 Aug 2024, 06:32 UTC · CWE-191 · Integer Underflow (Wrap or Wraparound)

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-2020-12276
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-2020-12276↗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.
Free version - for non-commercial use only.CVE-2020-1400 · cve.blacktree.nl