Security readout for executives and security teams
Plain-English summary
This is a Skype for Business Server vulnerability that Microsoft rates medium, but CISA lists it as known exploited. An unauthenticated network attacker could trigger server-side request forgery behavior, creating a real priority for organizations still running affected Skype for Business Server builds.
Executive priority
Treat this as a near-term remediation item. The technical score is medium, but known exploitation and unauthenticated network reachability raise business urgency for any remaining Skype for Business Server estate.
Technical view
CVE-2023-41763 affects Skype for Business Server 2015 CU13 version 9319.0 and 2019 CU7 version 2046.0. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N, mapped to CWE-918. Sources describe limited confidentiality impact and no integrity or availability impact.
Likely exposure
Exposure is most likely in organizations with internet-reachable or internally reachable Skype for Business Server 2015 CU13 or 2019 CU7 at the listed vulnerable build levels.
Exploitation context
CISA KEV status supports known exploitation. The source bundle does not provide exploit details, observed targets, exploitation volume, or attacker tradecraft, so those points should not be inferred.
Researcher notes
The public bundle identifies CWE-918 and a low-confidentiality impact SSRF-class issue, but does not include request paths, indicators, or proof-of-concept details. Validation should stay focused on version, patch state, and exposure.
Mitigation direction
- Review Microsoft MSRC guidance for CVE-2023-41763.
- Apply the vendor-listed security update for affected Skype for Business Server builds.
- Prioritize systems exposed to untrusted networks.
- Restrict unnecessary external access until remediation is verified.
- Track completion against CISA KEV-driven remediation expectations.
Validation and detection
- Inventory Skype for Business Server deployments and versions.
- Confirm whether 2015 CU13 9319.0 or 2019 CU7 2046.0 are present.
- Verify Microsoft’s CVE-specific update is installed.
- Review exposure of Skype for Business services to untrusted networks.
- Monitor vendor and CISA pages for updated guidance.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2023-41763 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- Skype for Business Elevation of Privilege VulnerabilityCVE reference · vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-41763CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.