CVE-2023-41763 | Skype for Business Elevation of Privilege Vulnerability

Exp

Skype for Business Elevation of Privilege Vulnerability

Published: 2023-10-10 Last update: 2025-10-28 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-41763 is rated Active Exploitation (76.7/100): CVSS Medium severity, with high exploitation likelihood (EPSS 16.50%, 95th percentile). CISA KEV confirms active exploitation (added 2023-10-10) affecting Microsoft / Skype for Business. a weakness (CWE-918) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

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

CISA KEV Record for CVE-2023-41763

Name: Microsoft Skype for Business Privilege Escalation Vulnerability · CISA KEV detail

Exploit added: 2023-10-10

Action due: 2023-10-31

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Exploit prediction scoring system (EPSS) score for CVE-2023-41763

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 2026-04-20 19.17% 16.50% -2.68%
2 2026-04-04 18.49% 19.17% +0.68%
3 2026-04-02 — 18.49% —

Full EPSS history (75 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-41763

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N 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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]

Weakness enumeration for CVE-2023-41763

Affected software / configurations for CVE-2023-41763

Vendor Product Version Raw CPE
microsoft skype_for_business_server 2015 cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13:*:*:*:*:*:*
microsoft skype_for_business_server 2019 cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_7:*:*:*:*:*:*

References for CVE-2023-41763

cvelogic Threat Intelligence