CVE-2023-21803 | Windows iSCSI Discovery Service Remote Code Execution Vulnerability

Windows iSCSI Discovery Service Remote Code Execution Vulnerability

Published: 2023-02-14 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-21803 is rated Moderate Risk (60.5/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.76%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-21803

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 13.93% 1.76% -12.16%
2 2026-03-01 11.65% 13.93% +2.27%
3 2026-02-28 — 11.65% —

Full EPSS history (46 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-21803

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2023-21803

Affected software / configurations for CVE-2023-21803

Vendor Product Version Raw CPE
microsoft windows_10 < 10.0.10240.19747 cpe:2.3:o:microsoft:windows_10:*:*:*:*:*:*:x86:*
microsoft windows_10_1607 < 10.0.14393.5717 cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
microsoft windows_10_1809 < 10.0.17763.4010 cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
microsoft windows_10_20h2 < 10.0.19042.2604 cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:x86:*
microsoft windows_10_21h2 < 10.0.19044.2604 cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*
microsoft windows_10_22h2 < 10.0.19045.2604 cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*
microsoft windows_server_2008 — cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x86:*

References for CVE-2023-21803

cvelogic Threat Intelligence