CVE-2018-8546 Denial of service in Microsoft Lync

What is CVE-2018-8546?

CVE-2018-8546 is a medium-severity denial of service vulnerability in Microsoft Office, published on 14 Nov 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A denial of service vulnerability exists in Skype for Business, aka "Microsoft Skype for Business Denial of Service Vulnerability." This affects Office 365 ProPlus, Microsoft Office, Microsoft Lync, Skype.

Which versions are affected by CVE-2018-8546?

It affects 6 products.

Products include Microsoft Lync, Microsoft Lync Basic, Microsoft Office, Microsoft Office 365 Proplus, Microsoft Skype for Business, Microsoft Skype for Business Basic.

How do I fix CVE-2018-8546?

No fix has been published for CVE-2018-8546 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2018-8546 being exploited?

There is no known exploitation of CVE-2018-8546 in the wild and no public exploit code.

Other vulnerabilities in Microsoft Office

• CVE-2020-1025 Microsoft Office Elevation of Privilege Vulnerability Critical 9.8
• CVE-2013-1302 Use after free in n/a Critical 9.3
• CVE-2012-1849 Path traversal in n/a Critical 9.3
• CVE-2018-8311 Code injection in Microsoft Lync High 8.8
• CVE-2017-11786 Auth bypass in Skype for Business High 8.8

All Microsoft Office vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-jwxg-487g-c8pg.