# CVE-2019-1209: Information disclosure in Microsoft Lync Server

> An attacker can exploit an information disclosure vulnerability in Microsoft Lync Server to access sensitive data.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 11 Sep 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-6rjq-46qf-87g8

## What is CVE-2019-1209?

CVE-2019-1209 is a medium-severity vulnerability in Microsoft Lync Server, published on 11 Sep 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

An information disclosure vulnerability exists in Lync 2013, aka 'Lync 2013 Information Disclosure Vulnerability'.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2019-1209?

It affects 1 product.


Products: Microsoft Lync.

## How do I fix CVE-2019-1209?

No fix has been published for CVE-2019-1209 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-1209 being exploited?

There is no known exploitation of CVE-2019-1209 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Lync Server

- [CVE-2020-1025](https://insights.sbomify.com/CVE-2020-1025/): Microsoft Office Elevation of Privilege Vulnerability (critical 9.8)
- [CVE-2013-1302](https://insights.sbomify.com/CVE-2013-1302/): Use after free in n/a (critical 9.3)
- [CVE-2012-1849](https://insights.sbomify.com/CVE-2012-1849/): Path traversal in n/a (critical 9.3)
- [CVE-2018-8311](https://insights.sbomify.com/CVE-2018-8311/): Code injection in Microsoft Lync (high 8.8)
- [CVE-2017-11786](https://insights.sbomify.com/CVE-2017-11786/): Auth bypass in Skype for Business (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-1209 and fix it if it is affected.

What it is: CVE-2019-1209 is a medium-severity vulnerability in Microsoft Lync Server, published on 11 Sep 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-1209 in the wild and no public exploit code.

Affected product: Microsoft Lync Server. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-1209/ (Markdown: https://insights.sbomify.com/CVE-2019-1209/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-1209
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-1209
- OSV: https://osv.dev/vulnerability/CVE-2019-1209

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-1209/
Summaries are generated and may contain mistakes; the official description above is the record.