# CVE-2020-3495: Cisco Jabber for Windows Message Handling Arbitrary Code Execution Vulnerability

> An authenticated remote attacker can execute arbitrary code on a user's system by sending crafted XMPP messages to the Cisco Jabber Windows client.

- **Severity:** Critical 9.9 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Sep 2020
- **Updated:** 13 Nov 2024
- **Also known as:** GHSA-fgm2-2fhw-x8fx

## What is CVE-2020-3495?

CVE-2020-3495 is a critical code injection vulnerability in Cisco Jabber, published on 4 Sep 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability in Cisco Jabber for Windows could allow an authenticated, remote attacker to execute arbitrary code. The vulnerability is due to improper validation of message contents. An attacker could exploit this vulnerability by sending specially crafted Extensible Messaging and Presence Protocol (XMPP) messages to the affected software. A successful exploit could allow the attacker to cause the application to execute arbitrary programs on the targeted system with the privileges of the user account that is running the Cisco Jabber client software, possibly resulting in arbitrary code execution.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2020-3495?

It affects 1 product.


Products: Cisco Jabber.

## How do I fix CVE-2020-3495?

No fix has been published for CVE-2020-3495 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3495 being exploited?

There is no known exploitation of CVE-2020-3495 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-2020-3495 and fix it if it is affected.

What it is: CVE-2020-3495 is a critical code injection vulnerability in Cisco Jabber, published on 4 Sep 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-3495 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-2020-3495/ (Markdown: https://insights.sbomify.com/CVE-2020-3495/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3495
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3495
- OSV: https://osv.dev/vulnerability/CVE-2020-3495

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-3495/
Summaries are generated and may contain mistakes; the official description above is the record.