Null pointer dereference in Skype for Business

Publication date: 2026-09-08

Last updated on: 2026-09-08

Assigner: Microsoft Corporation

Description

Null pointer dereference in Skype for Business allows an authorized attacker to deny service over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-08

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-66303

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	skype_for_business	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-476	The product dereferences a pointer that it expects to be valid but is NULL.

Attack-Flow Graph

Executive Summary

This vulnerability is a null pointer dereference flaw in Skype for Business. It allows an authorized attacker to cause a denial of service over a network by exploiting this issue.

Impact Analysis

An attacker could exploit this to crash Skype for Business, disrupting communication services. This may lead to loss of availability for critical business operations relying on the software.

Mitigation Strategies

Apply the latest security updates from Microsoft for Skype for Business to address the null pointer dereference issue. Monitor network traffic for unusual patterns that may indicate denial-of-service attempts targeting this vulnerability.

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