# CVE-2022-20755: Cisco Expressway Series and Cisco TelePresence Video Communication Server Vulnerabilities

> Authenticated attackers can exploit path traversal to write files and execute arbitrary code as root on Cisco Expressway and VCS devices.

- **Severity:** Critical 9.0 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Apr 2022
- **Updated:** 6 Nov 2024
- **Also known as:** GHSA-r28m-fphr-v4pf

## What is CVE-2022-20755?

CVE-2022-20755 is a critical path traversal vulnerability in Cisco TelePresence Video Communication Server (VCS) Expressway, published on 6 Apr 2022. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Multiple vulnerabilities in the API and web-based management interfaces of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow an authenticated, remote attacker with read/write privileges to the application to write files or execute arbitrary code on the underlying operating system of an affected device as the root user. For more information about these vulnerabilities, see the Details section of this advisory.

Weakness: CWE-23 (Relative Path Traversal)

## Which versions are affected by CVE-2022-20755?

It affects 1 product.


Products: Cisco Telepresence Video Communication Server.

## How do I fix CVE-2022-20755?

No fix has been published for CVE-2022-20755 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-20755 being exploited?

There is no known exploitation of CVE-2022-20755 in the wild and no public exploit code.

## Other vulnerabilities in Cisco TelePresence Video Communication Server (VCS) Expressway

- [CVE-2023-20105](https://insights.sbomify.com/CVE-2023-20105/): Privilege escalation in Cisco TelePresence Video Communication Server (VCS) Expressway (critical 9.6)
- [CVE-2023-20192](https://insights.sbomify.com/CVE-2023-20192/): Cisco Expressway Series and Cisco TelePresence Video Communication Server Privilege Escalation Vulnerabilities (critical 9.6)
- [CVE-2022-20754](https://insights.sbomify.com/CVE-2022-20754/): Cisco Expressway Series and Cisco TelePresence Video Communication Server Vulnerabilities (critical 9.0)
- [CVE-2016-1468](https://insights.sbomify.com/CVE-2016-1468/): Command injection in n/a (high 8.8)
- [CVE-2019-1845](https://insights.sbomify.com/CVE-2019-1845/): Denial of service in Cisco TelePresence Video Communication Server (VCS) (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-20755 and fix it if it is affected.

What it is: CVE-2022-20755 is a critical path traversal vulnerability in Cisco TelePresence Video Communication Server (VCS) Expressway, published on 6 Apr 2022. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-20755 in the wild and no public exploit code.

Affected product: Cisco TelePresence Video Communication Server (VCS) Expressway. 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-2022-20755/ (Markdown: https://insights.sbomify.com/CVE-2022-20755/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-20755
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-20755
- OSV: https://osv.dev/vulnerability/CVE-2022-20755

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-20755/
Summaries are generated and may contain mistakes; the official description above is the record.