CVE-2021-24099 Skype for Business and Lync Denial of Service Vulnerability
Attackers can cause a denial of service in Skype for Business and Lync servers, requiring administrators to apply security patches.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-24099?
CVE-2021-24099 is a medium-severity denial of service vulnerability in Microsoft Lync Server 2013, published on 25 Feb 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Skype for Business and Lync Denial of Service Vulnerability
Which versions are affected by CVE-2021-24099?
It affects 2 products.
Products include Microsoft Lync Server, Microsoft Skype for Business Server.
How do I fix CVE-2021-24099?
No fix has been published for CVE-2021-24099 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-2021-24099 being exploited?
There is no known exploitation of CVE-2021-24099 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Lync Server 2013
- CVE-2022-33633 Skype for Business and Lync Remote Code Execution Vulnerability
- CVE-2021-26422 Skype for Business and Lync Remote Code Execution Vulnerability
- CVE-2022-26911 Skype for Business Information Disclosure Vulnerability
- CVE-2021-26421 Skype for Business and Lync Spoofing Vulnerability
- CVE-2021-24073 Skype for Business and Lync Spoofing Vulnerability
Sources
Also known as GHSA-gr3f-8f43-4w8g.