# CVE-2020-3430: Cisco Jabber for Windows Protocol Handler Command Injection Vulnerability

> Remote attackers can execute arbitrary commands on Windows systems by tricking users into clicking malicious links in Cisco Jabber.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **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:** 4 Sep 2020
- **Updated:** 13 Nov 2024
- **Also known as:** GHSA-hqr6-633p-3x2j

## What is CVE-2020-3430?

CVE-2020-3430 is a high-severity command injection vulnerability in Cisco Jabber, published on 4 Sep 2020. 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

A vulnerability in the application protocol handling features of Cisco Jabber for Windows could allow an unauthenticated, remote attacker to execute arbitrary commands. The vulnerability is due to improper handling of input to the application protocol handlers. An attacker could exploit this vulnerability by convincing a user to click a link within a message sent by email or other messaging platform. A successful exploit could allow the attacker to execute arbitrary commands on a targeted system with the privileges of the user account that is running the Cisco Jabber client software.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2020-3430?

It affects 1 product.


Products: Cisco Jabber.

## How do I fix CVE-2020-3430?

No fix has been published for CVE-2020-3430 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3430 being exploited?

There is no known exploitation of CVE-2020-3430 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Jabber

- [CVE-2021-1411](https://insights.sbomify.com/CVE-2021-1411/): Cisco Jabber Desktop and Mobile Client Software Vulnerabilities (critical 9.9)
- [CVE-2021-1417](https://insights.sbomify.com/CVE-2021-1417/): Cisco Jabber Desktop and Mobile Client Software Vulnerabilities (critical 9.9)
- [CVE-2021-1418](https://insights.sbomify.com/CVE-2021-1418/): Cisco Jabber Desktop and Mobile Client Software Vulnerabilities (critical 9.9)
- [CVE-2021-1469](https://insights.sbomify.com/CVE-2021-1469/): Cisco Jabber Desktop and Mobile Client Software Vulnerabilities (critical 9.9)
- [CVE-2021-1471](https://insights.sbomify.com/CVE-2021-1471/): Cisco Jabber Desktop and Mobile Client Software Vulnerabilities (critical 9.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-3430 and fix it if it is affected.

What it is: CVE-2020-3430 is a high-severity command injection vulnerability in Cisco Jabber, published on 4 Sep 2020. 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-2020-3430 in the wild and no public exploit code.

Affected product: Cisco Jabber. 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-2020-3430/ (Markdown: https://insights.sbomify.com/CVE-2020-3430/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3430
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3430
- OSV: https://osv.dev/vulnerability/CVE-2020-3430

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-3430/
Summaries are generated and may contain mistakes; the official description above is the record.