CVE-2023-21803
published 2023-02-14CVE-2023-21803: Windows iSCSI Discovery Service Remote Code Execution Vulnerability
PriorityP261critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
1.76%
75.6th percentile
Windows iSCSI Discovery Service Remote Code Execution Vulnerability
Affected
20 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_10 | < 10.0.10240.19747 | 10.0.10240.19747 |
| microsoft | windows_10_1607 | < 10.0.14393.5717 | 10.0.14393.5717 |
| microsoft | windows_10_1809 | < 10.0.17763.4010 | 10.0.17763.4010 |
| microsoft | windows_10_20h2 | < 10.0.19042.2604 | 10.0.19042.2604 |
| microsoft | windows_10_21h2 | < 10.0.19044.2604 | 10.0.19044.2604 |
| microsoft | windows_10_22h2 | < 10.0.19045.2604 | 10.0.19045.2604 |
| microsoft | windows_10_version_1507 | >= 10.0.10240.0 < 10.0.10240.19747 | 10.0.10240.19747 |
| microsoft | windows_10_version_1607 | >= 10.0.14393.0 < 10.0.14393.5717 | 10.0.14393.5717 |
| microsoft | windows_10_version_1809 | >= 10.0.17763.0 < 10.0.17763.4010 | 10.0.17763.4010 |
| microsoft | windows_10_version_20h2 | >= 10.0.0 < 10.0.19042.2604 | 10.0.19042.2604 |
| microsoft | windows_10_version_21h2 | >= 10.0.19043.0 < 10.0.19044.2604 | 10.0.19044.2604 |
| microsoft | windows_10_version_22h2 | >= 10.0.19045.0 < 10.0.19045.2604 | 10.0.19045.2604 |
| microsoft | windows_server_2008_service_pack_2 | >= 6.0.6003.0 < 6.0.6003.21915 | 6.0.6003.21915 |
| msrc | windows_10_for_32-bit_systems | — | — |
| msrc | windows_10_version_1607_for_32-bit_systems | — | — |
| msrc | windows_10_version_1809_for_32-bit_systems | — | — |
| msrc | windows_10_version_20h2_for_32-bit_systems | — | — |
| msrc | windows_10_version_21h2_for_32-bit_systems | — | — |
| msrc | windows_10_version_22h2_for_32-bit_systems | — | — |
| msrc | windows_server_2008_for_32-bit_systems_service_pack_2 | — | — |
Detection & IOCsextracted from sources · hover to see the quote
- →Monitor for specially crafted DHCP discovery requests targeting the iSCSI Discovery Service, particularly on 32-bit (x86) Windows systems. ↗
- →Scope detection to x86/32-bit Windows hosts only — 64-bit systems are not affected. ↗
- →Alert on iSCSI Initiator client application being enabled, as it is disabled by default and must be active for exploitation to succeed. ↗
- ·Vulnerability only affects 32-bit (x86) Windows; 64-bit systems are not impacted, so detections should be scoped accordingly. ↗
- ·The iSCSI Initiator client application must be explicitly enabled for a system to be exploitable; default-disabled state prevents attack. ↗
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_msrc9.8CRITICAL
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GHSA
GHSA-rjwv-mm96-c3w9: Windows iSCSI Discovery Service Remote Code Execution Vulnerability
ghsa_unreviewed·2023-02-14
CVE-2023-21803 [CRITICAL] GHSA-rjwv-mm96-c3w9: Windows iSCSI Discovery Service Remote Code Execution Vulnerability
Windows iSCSI Discovery Service Remote Code Execution Vulnerability
Microsoft
Windows iSCSI Discovery Service Remote Code Execution Vulnerability
vendor_msrc·2023-02-14·CVSS 9.8
CVE-2023-21803 [CRITICAL] CWE-190 Windows iSCSI Discovery Service Remote Code Execution Vulnerability
Windows iSCSI Discovery Service Remote Code Execution Vulnerability
FAQ: How could an attacker exploit the vulnerability?
An attacker could exploit the vulnerability by sending a specially crafted malicious DHCP discovery request to the iSCSI Discovery Service on 32-bit machines. An attacker who successfully exploited the vulnerability could then gain the ability to execute code on the target system.
Windows iSCSI: Windows iSCSI
Microsoft: Microsoft
Customer Action Required: Yes
Impact: Remote Code Execution
Exploit Status: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely;DOS:N/A
Reference: https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5022840
Reference: https://support.microsoft.com/help/5022840
Reference: https://catalog.update.m
No detection rules found.
No public exploits indexed.
Qualys
The February 2023 Patch Tuesday Security Update Review
blogs_qualys·2023-02-15
The February 2023 Patch Tuesday Security Update Review
## Table of Contents
Microsoft Patches for February2023
Adobe Patches for February2023
Notable and Critical Microsoft Vulnerabilities Patched
Other Microsoft Vulnerability Highlights
Microsoft Release Summary
Discover and Prioritize Vulnerabilities in Vulnerability Management, Detection & Response (VMDR)
Rapid Response with Patch Management (PM)
EVALUATE Vendor-Suggested Mitigation with Policy Compliance (PC)
Qualys Monthly Webinar Series
This Month in Vulnerabilities & Patches
Microsoft and Adobe have released several monthly security fixes and updates for their products. Let’s take a look at the highlights of this month’s Patch Tuesday as we review and discuss the security updates.
## Microsoft Patches for February 2023
Microsoft has patched 79 vulnerabilities this month, in
Qualys
The February 2023 Patch Tuesday Security Update Review | Qualys
blogs_qualys·2023-02-15
The February 2023 Patch Tuesday Security Update Review | Qualys
#### Table of Contents
- Microsoft Patches for February2023
- Adobe Patches for February2023
- Notable and Critical Microsoft Vulnerabilities Patched
- Other Microsoft Vulnerability Highlights
- Microsoft Release Summary
- Discover and Prioritize Vulnerabilities in Vulnerability Management, Detection & Response (VMDR)
- Rapid Response with Patch Management (PM)
- EVALUATE Vendor-Suggested Mitigation with Policy Compliance (PC)
- Qualys Monthly Webinar Series
- This Month in Vulnerabilities & Patches
Microsoft and Adobe have released several monthly security fixes and updates for their products. Let’s take a look at the highlights of this month’s Patch Tuesday as we review and discuss the security updates.
## Microsoft Patches for February 2023
Microsoft has patched 79 vulnerabilities t
Talos
Microsoft Patch Tuesday for February 2023 — Snort rules and prominent vulnerabilities
blogs_talos·2023-02-14·CVSS 9.8
CVE-2023-21823 [CRITICAL] Microsoft Patch Tuesday for February 2023 — Snort rules and prominent vulnerabilities
Microsoft released its monthly security update on Tuesday, disclosing 73 vulnerabilities. Of these vulnerabilities, 8 are classified as “Critical”, 64 are classified as “Important”, one vulnerability is classified as “Moderate.”
According to Microsoft none of the vulnerabilities has been publicly disclosed before Patch Tuesday and only three vulnerabilities were seen in the wild. The most serious one is CVE-2023-21823 a Windows Graphics Component Remote Code Execution Vulnerability. Followed by CVE-2023-21715 a Microsoft Publisher Security Features Bypass Vulnerability which we are describing below and CVE-2023-23376 a local Windows Common Log File System Driver Elevation of Privilege Vulnerability.
Three of the most “Critical“ vulnerabilities, which Microsoft considers to be “more likel
Talos
Microsoft Patch Tuesday for February 2023 — Snort rules and prominent vulnerabilities
blogs_talos·2023-02-14·CVSS 9.8
[CRITICAL] Microsoft Patch Tuesday for February 2023 — Snort rules and prominent vulnerabilities
## Microsoft Patch Tuesday for February 2023 — Snort rules and prominent vulnerabilities
Microsoft released its monthly security update on Tuesday, disclosing 73 vulnerabilities. Of these vulnerabilities, 8 are classified as “Critical”, 64 are classified as “Important”, one vulnerability is classified as “Moderate.”
According to Microsoft none of the vulnerabilities has been publicly disclosed before Patch Tuesday and only three vulnerabilities were seen in the wild. The most serious one is CVE-2023-21823 a Windows Graphics Component Remote Code Execution Vulnerability. Followed by CVE-2023-21715 a Microsoft Publisher Security Features Bypass Vulnerability which we are describing below and CVE-2023-23376 a local Windows Common Log File System Driver Elevation of Privilege Vulnerability.
Crowdstrike
February 2023 Patch Tuesday: Updates and Analysis
blogs_crowdstrike·CVSS 7.5
CVE-2026-20929 [HIGH] February 2023 Patch Tuesday: Updates and Analysis
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Video Highlights the 4 Key Steps to Successful Incident Response Dec 02, 2019
Helping Non-Security Stakeholders Understand ATT&CK in 10 Minutes or Less [VI
Crowdstrike
February 2023 Patch Tuesday: Updates and Analysis
blogs_crowdstrike·CVSS 7.5
CVE-2026-20929 [HIGH] February 2023 Patch Tuesday: Updates and Analysis
How CrowdStrike is Accelerating Exposure Evaluation as Adversaries Gain Speed Apr 06, 2026
STARDUST CHOLLIMA Likely Compromises Axios npm Package Apr 01, 2026
Falcon for IT Supports Windows Secure Boot Certificate Lifecycle Management Apr 01, 2026
Detecting CVE-2026-20929: Kerberos Authentication Relay via CNAME Abuse Mar 31, 2026
How CrowdStrike is Accelerating Exposure Evaluation as Adversaries Gain Speed Apr 06, 2026
STARDUST CHOLLIMA Likely Compromises Axios npm Package Apr 01, 2026
Falcon for IT Supports Windows Secure Boot Certificate Lifecycle Management Apr 01, 2026
Detecting CVE-2026-20929: Kerberos Authentication Relay via CNAME Abuse Mar 31, 2026
Video Highlights the 4 Key Steps to Successful Incident Response Dec 02, 2019
Helping Non-Security Stakeholders Understand AT
2023-02-14
Published