SSRF in Microsoft Skype For Business Server
CVE-2023-41763
Skype for Business Elevation of Privilege Vulnerability
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.905 (99.8th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.904 · newest: 0.905 · change: +0.002
Affected products
- Microsoft Skype For Business Server — versions 2015, 2019
- Microsoft Skype For Business Server 2015 Cu13 — versions 9319.0
- Microsoft Skype For Business Server 2019 Cu7 — versions 2046.0
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Public proof-of-concept exploits
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2023-41763 (vendor-advisory, Patch, Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2023-41763?
- CVE-2023-41763 is a medium-severity vulnerability in Microsoft Skype For Business Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.3/10. Published 2023-10-10.
- How severe is CVE-2023-41763?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2023-41763 known to be exploited?
- Yes. CVE-2023-41763 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-10-10), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.