BlackTreeCVE Intelligence
← Back to the CVE catalogue
Full vulnerability report · 2019
CVE-2019-0657High confidence

A vulnerability exists in certain .Net Framework API's and Visual Studio in the way they parse URL's, aka '.NET Framework and Visual Studio Spoofing Vulnerability'

Microsoft · Microsoft .NET Framework 4.5.2

Official source article: Red Hat RHSA-2019:0349 ↗. Check the applicable product and release in the original source.

5.9MediumCVSS 3.0
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 4.52% 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.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Microsoft Microsoft .NET Framework 4.5.2 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: As exposure requiresRemediation target: Within 365 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.

Open-source package ranges3 source-attributed ranges

These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.

Ecosystem and packageAffected rangeFirst fixed versionEvidence
NuGetMicrosoft.NETCore.AppECOSYSTEM: introduced 2.2.0; fixed 2.2.22.2.2OSV record ↗aggregator derived · 8 Nov 2023
NuGetMicrosoft.NETCore.AppECOSYSTEM: introduced 2.1.0; fixed 2.1.82.1.8OSV record ↗aggregator derived · 8 Nov 2023
NuGetSystem.Private.UriECOSYSTEM: introduced 4.3.0; fixed 4.3.24.3.2OSV record ↗aggregator derived · 8 Nov 2023
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-2022-5721

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 actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

A vulnerability exists in certain .Net Framework API's and Visual Studio in the way they parse URL's, aka '.NET Framework and Visual Studio Spoofing Vulnerability'.

What

A vulnerability exists in certain .Net Framework API's and Visual Studio in the way they parse URL's, aka '.NET Framework and Visual Studio Spoofing Vulnerability'.

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 a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

A vulnerability exists in certain .Net Framework API's and Visual Studio in the way they parse URL's, aka '.NET Framework and Visual Studio Spoofing Vulnerability'.

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 a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

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
a network path → Improper Input Validation → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
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-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:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Common Vulnerability Scoring System 3.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.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.CNoneConfidentiality impact: No direct loss is represented by this metric.IHighIntegrity impact: A successful attack can cause a major loss.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-20
A

Official authority intelligence

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

CERT-FR · French · CERTFR-2019-AVI-063Multiples vulnérabilités dans Microsoft .Net

De multiples vulnérabilités ont été corrigées dans Microsoft .Net . Elles permettent à un attaquant de provoquer une exécution de code à distance et une usurpation d'identité.

Official advisory ↗
CERT-FR · French · CERTFR-2019-AVI-064Multiples vulnérabilités dans les produits Microsoft

.cve.org/CVERecord?id=CVE-2019-0640 Référence CVE CVE-2019-0642 https://www.cve.org/CVERecord?id=CVE-2019-0642 Référence CVE CVE-2019-0644 https://www.cve.org/CVERecord?id=CVE-2019-0644 Référence CVE CVE-2019-0646 https://www.cve.org/CVERecord?id=CVE-2019-0646 Référence CVE CVE-2019-0647 https://www.cve.org/CVERecord?id=CVE-2019-0647 Référence CVE CVE-2019-0649 https://www.cve.org/CVERecord?id=CVE-2019-0649 Référence CVE CVE-2019-0651 https://www.cve.org/CVERecord?id=CVE-2019-0651 Référence CVE CVE-2019-0652 https://www.cve.org/CVERecord?id=CVE-2019-0652 Référence CVE CVE-2019-0655 https://www.cve.org/CVERecord?id=CVE-2019-0655 Référence CVE CVE-2019-0657 https://www.cve.org/CVERecord?id=CVE-2019-0657 Référence CVE CVE-2019-0658 https://www.cve.org/CVERecord?id=CVE-2019-0658 Référence CVE CVE-2019-0728 https://www.cve.org/CVERecord?id=CVE-2019-0728 Référence CVE CVE-2019-0729 https://www.cve.org/CVERecord?id=CVE-2019-0729 Référence CVE CVE-2019-0741 https://www.cve.org/CVERecord?id=CVE-2019-0741 Référence CVE CVE-2019-0742 https://www.cve.org/CVERecord?id=CVE-2019-0742 Référence CVE CVE-2019-0743 https://www.cve.org/CVERecord?id=CVE-2019-0743 Gestion détaillée du document le 13 février 2019 Version initiale Alertes Avis Bulletins d’actualités Mentions légales Conditions générales À propos Con

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2019-002326複数の Microsoft 製品における入力確認に関する脆弱性

複数の Microsoft 製品には、URL の解析方法に不備があるため、入力確認に関する脆弱性が存在します。 ベンダは、本脆弱性を「.NET Framework と Visual Studio のなりすましの脆弱性」として公開しています。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-4987MS 2월 보안 위협에 따른 정기 보안 업데이트 권고

실행 o 중요도 : 긴급 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 9. Office 보안 업데이트 ##### □ 설명 o 이용자가 특수하게 제작된 악성 문서를 열람할 경우, 원격코드실행을 허용하는 취약점 o 관련취약점 : - 원격코드실행 취약점(CVE-2019-0671,CVE-2019-0672,CVE-2019-0673,CVE-2019-0674,CVE-2019-0675) - 보안기능 우회 취약점(CVE-2019-0540,CVE-2019-0669) o 영향 : 원격코드실행 o 중요도 : 중요 o 관련 KB번호 - 4092465, 4462138, 4462146, 4462174, 4462154, 4461607, 4462186, 4462115, 4461597, 4462177, 4461608, 4018300, 4018294, 4018313 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 10. Visual Studio 보안 업데이트 ##### □ 설명 o 공격자가 특수하게 제작된 악성 응용 프로그램을 실행할 경우, 원격코드실행을 허용하는 취약점 o 관련취약점 : - 원격코드실행 취약점(CVE-2019-0613,CVE-2019-0728) - 스푸핑 취약점(CVE-2019-0657) o 영향 : 원격코드실행 o 중요도 : 중요 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 11. SharePoint Server, SharePoint Enterprise Server 보안 업데이트 ##### □ 설명 o 이용자가 특수하게 제작된 악성 문서를 열람할 경우, 원격코드실행을 허용하는 취약점 o 관련취약점 : - 원격코드실행 취약점(CVE-2019-0594,CVE-2019-0604) - 권한상승 취약점(CVE-2019-0668) - 스푸핑 취약점(CVE-2019-0670) o 영향 : 원격코드실행 o 중요도 : 긴급 o 관련 KB번호 - 4461630, 4462143, 4462155, 4462171, 4462139 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 12. Skype 보안 업데이트 ##### □ 설명 o 보안 강화 업데이트 o 관련취약점 : - 스푸핑 취약점(CVE-2019-0624) o 영향 : 스푸핑 o 중요도 : 중요 o 관련 KB번호 - 3061064 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 13. Exchange Server 보안 업데이트 ##### □ 설명

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 6 Mar 2019 · Last source change 4 Aug 2024, 17:51 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 2026-09-01
European sourceENISA EUVD · EUVD-2022-5721
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 ↗
  1. ENISA EUVD mappingEUVD-2022-5721 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2022-5721"}
    ENISA EUVD ↗
  2. Vendor guidanceAuthoritative vendor guidance changed: added patch: portal.msrc.microsoft.com/CVE-2019-0657; added remediation: portal.msrc.microsoft.com/CVE-2019-0657; removed vendor advisory: access.redhat.com/RHSA-2019:0349.
    Before
    vendor advisory: access.redhat.com/RHSA-2019:0349
    After
    patch: portal.msrc.microsoft.com/CVE-2019-0657 · remediation: portal.msrc.microsoft.com/CVE-2019-0657
    portal.msrc.microsoft.com ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    Windows 7 for 32-bit Systems Service Pack 1; Windows 7 for x64-based Systems Service Pack 1; Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation); Windows Server 2008 R2 for x64-based Systems Service Pack 1; Windows Server 2012; Windows Server 2012 (Server Core installation); Windows 8.1 for 32-bit systems; Windows 8.1 for x64-based systems · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    Windows 7 for 32-bit Systems Service Pack 1; Windows 7 for x64-based Systems Service Pack 1; Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation); Windows Server 2008 R2 for x64-based Systems Service Pack 1; Windows Server 2012; Windows Server 2012 (Server Core installation); Windows 8.1 for 32-bit systems; Windows 8.1 for x64-based systems · 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.
    CNA ↗
  4. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    portal.msrc.microsoft.com ↗
  5. SeveritySeverity changed from Unknown to Medium.
    Before
    Unknown
    After
    Medium
    NIST NVD ↗
  6. CVSS scoreCVSS score changed from not recorded to 5.9 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N).
    Before
    not recorded
    After
    5.9 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N)
    NIST NVD ↗
  7. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
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-2022-5721↗Patch or update reference↗CVE authority or vendor reference · Red Hat RHSA-2019:0349↗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-2019-0657 · cve.blacktree.nl