CVE-2023-21717 | Microsoft SharePoint Server Elevation of Privilege Vulnerability

Microsoft SharePoint Server Elevation of Privilege Vulnerability

Published: 2023-02-14 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-21717 is rated High Risk (69.5/100): CVSS High severity, with high exploitation likelihood (EPSS 11.39%, 94th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.55% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize 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-2023-21717

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 2026-05-13 9.84% 11.39% +1.55%
2 2026-05-09 8.15% 9.84% +1.69%
3 2026-04-21 — 8.15% —

Full EPSS history (24 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-21717

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/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:L)
A normal user session is enough; they don’t have to be admin.
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.
 2.8 5.9 [email protected]

Weakness enumeration for CVE-2023-21717

Affected software / configurations for CVE-2023-21717

Vendor Product Version Raw CPE
microsoft sharepoint_enterprise_server 2013 cpe:2.3:a:microsoft:sharepoint_enterprise_server:2013:sp1:*:*:*:*:*:*
microsoft sharepoint_enterprise_server 2016 cpe:2.3:a:microsoft:sharepoint_enterprise_server:2016:*:*:*:*:*:*:*
microsoft sharepoint_foundation 2013 cpe:2.3:a:microsoft:sharepoint_foundation:2013:sp1:*:*:*:*:*:*
microsoft sharepoint_server — cpe:2.3:a:microsoft:sharepoint_server:-:*:*:*:subscription:*:*:*
microsoft sharepoint_server 2019 cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*

References for CVE-2023-21717

cvelogic Threat Intelligence