# CVE-2022-20805: Cisco Umbrella Secure Web Gateway File Decryption Bypass Vulnerability

> An authenticated adjacent attacker can bypass SSL decryption and content filtering in Cisco Umbrella SWG by crafting TLS requests with specific SNI extensions.

- **Severity:** Medium 4.1 (`CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Apr 2022
- **Updated:** 6 Nov 2024
- **Also known as:** GHSA-5j9q-qmpc-xr4h

## What is CVE-2022-20805?

CVE-2022-20805 is a medium-severity vulnerability in Cisco Umbrella Insights Virtual Appliance, published on 21 Apr 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in the automatic decryption process in Cisco Umbrella Secure Web Gateway (SWG) could allow an authenticated, adjacent attacker to bypass the SSL decryption and content filtering policies on an affected system. This vulnerability is due to how the decryption function uses the TLS Sever Name Indication (SNI) extension of an HTTP request to discover the destination domain and determine if the request needs to be decrypted. An attacker could exploit this vulnerability by sending a crafted request over TLS from a client to an unknown or controlled URL. A successful exploit could allow an attacker to bypass the decryption process of Cisco Umbrella SWG and allow malicious content to be downloaded to a host on a protected network. There are workarounds that address this vulnerability.

Weakness: CWE-327 (Use of a Broken or Risky Cryptographic Algorithm), CWE-693 (Protection Mechanism Failure)

## Which versions are affected by CVE-2022-20805?

It affects 1 product.


Products: Cisco Umbrella Secure Web Gateway.

## How do I fix CVE-2022-20805?

No fix has been published for CVE-2022-20805 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-20805 being exploited?

There is no known exploitation of CVE-2022-20805 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Umbrella Insights Virtual Appliance

- [CVE-2022-20738](https://insights.sbomify.com/CVE-2022-20738/): Cisco Umbrella Secure Web Gateway File Inspection Bypass Vulnerability (medium 5.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-20805 and fix it if it is affected.

What it is: CVE-2022-20805 is a medium-severity vulnerability in Cisco Umbrella Insights Virtual Appliance, published on 21 Apr 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-20805 in the wild and no public exploit code.

Affected product: Cisco Umbrella Insights Virtual Appliance. 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-2022-20805/ (Markdown: https://insights.sbomify.com/CVE-2022-20805/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-20805
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-20805
- OSV: https://osv.dev/vulnerability/CVE-2022-20805

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-20805/
Summaries are generated and may contain mistakes; the official description above is the record.