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Full vulnerability report · 2023
CVE-2023-21700High confidence

Windows iSCSI Discovery Service Denial of Service Vulnerability

Microsoft · Windows 10 Version 1507

7.5HighCVSS 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.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 1.65% 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 Windows 10 Version 1507 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-2023-25867

No EUVD known-exploited evidence

Windows iSCSI Discovery Service Denial of Service Vulnerability

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
7.5 · CVSS 3.1
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

Windows iSCSI Discovery Service Denial of Service Vulnerability

What

Windows iSCSI Discovery Service Denial of Service Vulnerability

Why

The product dereferences a pointer that it expects to be valid but is NULL.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

Windows iSCSI Discovery Service Denial of Service Vulnerability

Why

The product dereferences a pointer that it expects to be valid but is NULL.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

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 → NULL Pointer Dereference → disrupt the affected service
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-476 ↗

CWE-476: NULL Pointer Dereference. The product dereferences a pointer that it expects to be valid but is NULL.

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:N/I:N/A:H/E:U/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.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
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.
NetworkUnauthenticatedDenial of serviceCWE-476
A

Official authority intelligence

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

ENISA EUVD · EUVD-2023-25867Official EUVD mapping

Windows iSCSI Discovery Service Denial of Service Vulnerability

Official EUVD record ↗
Cyber Security Agency of Singapore · English · CSA-SB-20230215Security Bulletin 15 Feb 2023

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 15 Feb 2023, published on 15 February 2023. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2023-AVI-0130Multiples vulnérabilités dans Microsoft Windows

février 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21693 Bulletin de sécurité Microsoft CVE-2023-21694 du 14 février 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21694 Bulletin de sécurité Microsoft CVE-2023-21695 du 14 février 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21695 Bulletin de sécurité Microsoft CVE-2023-21697 du 14 février 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21697 Bulletin de sécurité Microsoft CVE-2023-21699 du 14 février 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21699 Bulletin de sécurité Microsoft CVE-2023-21700 du 14 février 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21700 Bulletin de sécurité Microsoft CVE-2023-21701 du 14 février 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21701 Bulletin de sécurité Microsoft CVE-2023-21702 du 14 février 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21702 Bulletin de sécurité Microsoft CVE-2023-21797 du 14 février 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21797 Bulletin de sécurité Microsoft CVE-2023-21798 du 14 février 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21798 Bulletin de sécurité Micr

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2023-001288複数の Microsoft Windows 製品 におけるサービス運用妨害 (DoS) の脆弱性

Microsoft Windows 10、Windows 11、Windows Server には、Windows iSCSI Discovery サービスに不備があるため、サービス運用妨害 (DoS) の脆弱性が存在します。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5870MS 2월 보안 위협에 따른 정기 보안 업데이트 권고

ver 원격 코드 실행 취약점 Microsoft Exchange Server CVE-2023-21710 Microsoft Exchange Server 원격 코드 실행 취약점 Microsoft Exchange Server CVE-2023-21707 Microsoft Exchange Server 원격 코드 실행 취약점 Microsoft Exchange Server CVE-2023-21706 Microsoft Exchange Server 원격 코드 실행 취약점 SQL Server CVE-2023-21705 Microsoft SQL Server 원격 코드 실행 취약점 SQL Server CVE-2023-21704 SQL Server용 Microsoft ODBC 드라이버 원격 코드 실행 취약점 Azure Data Box Gateway CVE-2023-21703 Azure Data Box Gateway 원격 코드 실행 취약점 Windows iSCSI CVE-2023-21702 Windows iSCSI 서비스 서비스 거부 취약점 Windows Protected EAP (PEAP) CVE-2023-21701 Microsoft PEAP(Protected Extensible Authentication Protocol) 서비스 거부 취약점 Windows iSCSI CVE-2023-21700 Windows iSCSI 검색 서비스 서비스 거부 취약점 Internet Storage Name Service CVE-2023-21699 Windows iSNS(Internet Storage Name Service) 서버 정보 노출 취약점 Internet Storage Name Service CVE-2023-21697 Windows iSNS(Internet Storage Name Service) 서버 정보 노출 취약점 Windows Protected EAP (PEAP) CVE-2023-21695 Microsoft PEAP(Protected Extensible Authentication Protocol) 원격 코드 실행 취약점 Windows Fax and Scan Service CVE-2023-21694 Windows 팩스 서비스에서 발생하는 원격 코드 실행 취약점 Microsoft PostScript Printer Driver CVE-2023-21693 Microsoft PostScript 프린터 드라이버 정보 유출 취약점 Windows Protected EAP (PEAP) CVE-2023-21692 Microsoft PEAP(Protected Extensible Authentication Protocol) 원격 코드 실행 취약점 Windows

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 14 Feb 2023 · Last source change 19 Aug 2026, 16:27 UTC · CWE-476 · NULL Pointer Dereference

CVE recordCVE.org · 5.2
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-2023-25867
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
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. Affected versionsThe structured affected or fixed version information changed.
    Before
    10.0.17763.0 < 10.0.17763.4010; 10.0.0 < 10.0.17763.4010; 10.0.20348.0 < 10.0.20348.1547; 10.0.0 < 10.0.19042.2604; 10.0.0 < 10.0.22621.1574; 10.0.19043.0 < 10.0.19044.2604 · 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.
    After
    10.0.10240.0 < 10.0.10240.19747; 10.0.14393.0 < 10.0.14393.5717; 10.0.17763.0 < 10.0.17763.4010; 10.0.0 < 10.0.17763.4010; 10.0.0 < 10.0.19042.2604; 10.0.19043.0 < 10.0.19044.2604; 10.0.19045.0 < 10.0.19045.2604; 10.0.0 < 10.0.22621.1574 · 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 ↗
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-2023-25867↗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-2023-21700 · cve.blacktree.nl