CVE-2023-21811
📛 CVE Title
Windows iSCSI Service Denial of Service Vulnerability
Description
Windows iSCSI Service Denial of Service Vulnerability
Overview
- State
- PUBLISHED
- Assigner (CNA)
- microsoft
- CVSS severity
- HIGH
- CVSS score
- 7.5 / 10
- CVSS vector
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- Effective score
- 7.5 / 10 HIGH source: CNA overview
- MSRC score
- 7.5 / 10 HIGH MS rating: Important · Denial of Service
- CWE(s)
-
CWE-126 - Reserved
- 2022-12-16
- Published
- 2023-02-14 08:00 UTC
- Last updated
- 2023-02-14 08:00 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2023/21xxx/CVE-2023-21811.json
- Linked Threat
- CVE-2023-21811 — Windows iSCSI Service Denial of Service Vulnerability
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2023-25977 - Assigner
- microsoft
- Published
- Feb 14, 2023, 7:33:14 PM
- Updated
- Jan 1, 2025, 12:41:01 AM
- EUVD base score (CVSS 3.1)
-
7.5 / 10
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 - EUVD-reported EPSS
- 17.0500
- Vendors
- Microsoft
- Products
-
Windows 11 version 21H2 (10.0.0 <10.0.22621.1574)Windows 10 Version 1809 (10.0.0 <10.0.17763.4010)Windows Server 2012 R2 (6.3.9600.0 <6.3.9600.20821)Windows Server 2008 Service Pack 2 (6.0.6003.0 <6.0.6003.21915)Windows Server 2012 R2 (Server Core installation) (6.3.9600.0 <6.3.9600.20821)Windows Server 2019 (Server Core installation) (10.0.17763.0 <10.0.17763.4010)Windows 10 Version 21H2 (10.0.19043.0 <10.0.19044.2604)Windows Server 2016 (Server Core installation) (10.0.14393.0 <10.0.14393.5717)Windows Server 2008 R2 Service Pack 1 (Server Core installation) (6.1.7601.0 <6.1.7601.26366)Windows Server 2008 R2 Service Pack 1 (6.1.7601.0 <6.1.7601.26366)Windows 10 Version 20H2 (10.0.0 <10.0.19042.2604)Windows Server 2012 (Server Core installation) (6.2.9200.0 <6.2.9200.24116)Windows Server 2008 Service Pack 2 (6.0.6003.0 <6.0.6003.21915)Windows Server 2012 (6.2.9200.0 <6.2.9200.24116)Windows Server 2022 (10.0.20348.0 <10.0.20348.1547)Windows 10 Version 22H2 (10.0.19045.0 <10.0.19045.2604)Windows 10 Version 1607 (10.0.14393.0 <10.0.14393.5717)Windows 10 Version 1507 (10.0.10240.0 <10.0.10240.19747)Windows Server 2016 (10.0.14393.0 <10.0.14393.5717)Windows 10 Version 1809 (10.0.17763.0 <10.0.17763.4010)Windows Server 2008 Service Pack 2 (Server Core installation) (6.0.6003.0 <6.0.6003.21915)Windows Server 2019 (10.0.17763.0 <10.0.17763.4010)Windows 11 version 22H2 (10.0.22621.0 <10.0.22621.1265)
- Aliases
-
GHSA-92r2-pf82-g6gp
ENISA description: Windows iSCSI Service Denial of Service Vulnerability
EUVD references (1)
Microsoft Security Response Center MSRC
Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-08-11 01:49 UTC (source: CVRF).
- MS severity
- Important
- Impact
- Denial of Service
- MS CVSS base score
- 7.5 / 10 (temporal 6.5)
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 - Exploit assessment
- Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely;DOS:N/A
- Release
- 2023-Feb
Microsoft remediations / KB articles (28)
- 5022840 — Vendor Fix / Security Update (fixed build 10.0.17763.4010)
- 5022840 — Update
- 5022842 — Vendor Fix / Security Update (fixed build 10.0.20348.1547)
- 5022842 — Update
- 5022921 — Vendor Fix / Security Hotpatch Update (fixed build 10.0.20348.1540)
- 5022834 — Vendor Fix / Security Update (fixed build 10.0.19042.2604)
- 5022834 — Update
- 5022836 — Vendor Fix / Security Update (fixed build 10.0.22621.1574)
- 5022845 — Vendor Fix / Security Update (fixed build 10.0.22621.1265)
- 5022845 — Update
- 5022858 — Vendor Fix / Security Update (fixed build 10.0.10240.19747)
- 5022838 — Vendor Fix / Security Update (fixed build 10.0.14393.5717)
- 5022890 — Vendor Fix / Monthly Rollup (fixed build 6.0.6003.21915)
- 5022890 — Update
- 5022893 — Vendor Fix / Security Only (fixed build 6.0.6003.21915)
- 5022893 — Update
- 5022872 — Vendor Fix / Monthly Rollup (fixed build 6.1.7601.26366)
- 5022872 — Update
- 5022874 — Vendor Fix / Security Only (fixed build 6.1.7601.26366)
- 5022874 — Update
- 5022903 — Vendor Fix / Monthly Rollup (fixed build 6.2.9200.24116)
- 5022903 — Update
- 5022895 — Vendor Fix / Security Only (fixed build 6.2.9200.24116)
- 5022895 — Update
- 5022899 — Vendor Fix / Monthly Rollup (fixed build 6.3.9600.20821)
- 5022899 — Update
- 5022894 — Vendor Fix / Security Only (fixed build 6.3.9600.20821)
- 5022894 — Update
Affected products (23)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Microsoft | Windows 10 Version 1809 |
10.0.17763.0 (affected)
|
32-bit Systems, x64-based Systems |
| Microsoft | Windows 10 Version 1809 |
10.0.0 (affected)
|
ARM64-based Systems |
| Microsoft | Windows Server 2019 |
10.0.17763.0 (affected)
|
x64-based Systems |
| Microsoft | Windows Server 2019 (Server Core installation) |
10.0.17763.0 (affected)
|
x64-based Systems |
| Microsoft | Windows Server 2022 |
10.0.20348.0 (affected)
|
x64-based Systems |
| Microsoft | Windows 10 Version 20H2 |
10.0.0 (affected)
|
32-bit Systems, ARM64-based Systems |
| Microsoft | Windows 11 version 21H2 |
10.0.0 (affected)
|
x64-based Systems, ARM64-based Systems |
| Microsoft | Windows 10 Version 21H2 |
10.0.19043.0 (affected)
|
32-bit Systems, ARM64-based Systems, x64-based Systems |
| Microsoft | Windows 11 version 22H2 |
10.0.22621.0 (affected)
|
ARM64-based Systems, x64-based Systems |
| Microsoft | Windows 10 Version 22H2 |
10.0.19045.0 (affected)
|
x64-based Systems, ARM64-based Systems, 32-bit Systems |
| Microsoft | Windows 10 Version 1507 |
10.0.10240.0 (affected)
|
32-bit Systems, x64-based Systems |
| Microsoft | Windows 10 Version 1607 |
10.0.14393.0 (affected)
|
32-bit Systems, x64-based Systems |
| Microsoft | Windows Server 2016 |
10.0.14393.0 (affected)
|
x64-based Systems |
| Microsoft | Windows Server 2016 (Server Core installation) |
10.0.14393.0 (affected)
|
x64-based Systems |
| Microsoft | Windows Server 2008 Service Pack 2 |
6.0.6003.0 (affected)
|
32-bit Systems |
| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) |
6.0.6003.0 (affected)
|
32-bit Systems, x64-based Systems |
| Microsoft | Windows Server 2008 Service Pack 2 |
6.0.6003.0 (affected)
|
x64-based Systems |
| Microsoft | Windows Server 2008 R2 Service Pack 1 |
6.1.7601.0 (affected)
|
x64-based Systems |
| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) |
6.1.7601.0 (affected)
|
x64-based Systems |
| Microsoft | Windows Server 2012 |
6.2.9200.0 (affected)
|
x64-based Systems |
| Microsoft | Windows Server 2012 (Server Core installation) |
6.2.9200.0 (affected)
|
x64-based Systems |
| Microsoft | Windows Server 2012 R2 |
6.3.9600.0 (affected)
|
x64-based Systems |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |
6.3.9600.0 (affected)
|
x64-based Systems |
Vendor references (1)
References embedded in the original CVE record by the assigning CNA.
- Windows iSCSI Service Denial of Service Vulnerability vendor-advisory
Web references (28)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- 5022834 msrc
- 5022836 msrc
- 5022838 msrc
- 5022840 msrc
- 5022842 msrc
- 5022845 msrc
- 5022858 msrc
- 5022872 msrc
- 5022874 msrc
- 5022890 msrc
- 5022893 msrc
- 5022894 msrc
- 5022895 msrc
- 5022899 msrc
- 5022903 msrc
- MSRC update guide: CVE-2023-21811 msrc
- 5022834 msrc
- 5022840 msrc
- 5022842 msrc
- 5022845 msrc
- 5022872 msrc
- 5022874 msrc
- 5022890 msrc
- 5022893 msrc
- 5022894 msrc
- 5022895 msrc
- 5022899 msrc
- 5022903 msrc
Remediations (16)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:attack.mitre.org
This mitigation can be implemented through the following measures: Regular Operating System Updates Implementation: Apply the latest Windows security updates monthly using WSUS (Windows Server Update Services) or a similar patch management solution. Configure systems to check for updates automatically and schedule reboots during maintenance ...
2026-06-04 14:15 UTC -
web:gemini.google.com
Meet Gemini, Google's AI assistant. Get help with writing, planning, brainstorming, and more. Experience the power of generative AI.
2026-06-04 14:15 UTC -
web:nvd.nist.gov
The NVD is the U.S. government repository of standards based vulnerability management data represented using the Security Content Automation Protocol (SCAP). This data enables automation of vulnerability management, security measurement, and compliance. The NVD includes databases of security checklist references, security-related software flaws, product names, and impact metrics. For ...
2026-06-04 14:15 UTC -
web:securityboulevard.com
Cybersecurity vulnerabilities pose significant risks to organizations in today's digital landscape. Left unaddressed, these vulnerabilities can lead to data breaches, financial losses, and reputational damage. Organizations must decide how to tackle vulnerabilities—through remediation , mitigation , or a combination of both. But which strategy is more effective? This blog explores the ...
2026-06-04 14:15 UTC -
web:www.bleepingcomputer.com
CISA has ordered government agencies to secure their systems against a high-severity Oracle WebLogic Server vulnerability that was patched two years ago and is now actively exploited in attacks.
2026-06-04 14:15 UTC -
web:www.oracle.com
This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.
2026-06-04 14:15 UTC -
web:windowsreport.com
It's that time of the month again: Microsoft has rolled out its Patch Tuesday updates for Windows 11 versions 23H2, 22H2, and 21H2. Windows 11 23H2 and 22H2 users will see their systems updated through KB5041585, while those on 21H2 will receive KB5041592.
2026-05-22 05:47 UTC -
web:www.bleepingcomputer.com
Microsoft has released an out-of-band (OOB) update to fix a security vulnerabilities affecting Windows 11 Enterprise devices that receive hotpatch updates instead of the regular Patch Tuesday ...
2026-05-22 05:47 UTC -
web:www.xda-developers.com
Windows 11's second emergency patch of the month fixes a nasty Outlook issue You no longer need to deploy your own fixes A few days ago, we caught wind that Outlook was really struggling on ...
2026-05-22 05:47 UTC -
web:www.computerworld.com
Each month, the team at Readiness analyzes the latest Patch Tuesday updates from Microsoft and provides detailed, actionable testing guidance. The company's Patch Tuesday release for February ...
2026-05-22 05:47 UTC -
web:www.cve.org
At cve .org, we provide the authoritative reference method for publicly known information-security vulnerabilities and exposures
2026-05-22 05:47 UTC -
web:cybersecuritynews.com
Microsoft released an out-of-band hotpatch update on March 13, 2026, addressing serious security vulnerabilities in Windows 11 versions 24H2 and 25H2.
2026-05-22 05:47 UTC -
web:www.msn.com
Windows 11 patch fix : Microsoft resolved May 2026 update failures tied to limited EFI partition space with automated rollback, IT admin workarounds, and registry-based adjustments. Exchange flaw ...
2026-05-22 05:47 UTC -
web:www.zdnet.com
Install Microsoft's emergency Windows patch now - what it fixes and why it was rushed out Microsoft issued an out-of-band fix after its latest update introduced a nasty surprise.
2026-05-22 05:47 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-05-22 05:47 UTC -
web:www.pcworld.com
This month's Patch Tuesday includes an actively exploited Office zero-day vulnerability and several critical RCE bugs in Windows and Remote Desktop.
2026-05-22 05:47 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2023-21811.json.
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