# CVE-2019-1672: Cisco Web Security Appliance Decryption Policy Bypass Vulnerability

> An unauthenticated remote attacker can bypass SSL decryption drop policies on Cisco WSA when end-user notification is disabled, allowing blocked traffic onto the network.

- **Severity:** Medium 5.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Feb 2019
- **Updated:** 19 Nov 2024
- **Also known as:** GHSA-xgwc-rmqj-wxqr

## What is CVE-2019-1672?

CVE-2019-1672 is a medium-severity vulnerability in Cisco Web Security Appliance, published on 8 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the Decryption Policy Default Action functionality of the Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to bypass a configured drop policy and allow traffic onto the network that should have been denied. The vulnerability is due to the incorrect handling of SSL-encrypted traffic when Decrypt for End-User Notification is disabled in the configuration. An attacker could exploit this vulnerability by sending a SSL connection through the affected device. A successful exploit could allow the attacker to bypass a configured drop policy to block specific SSL connections. Releases 10.1.x and 10.5.x are affected.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2019-1672?

It affects 1 product.


Products: Cisco Web Security Appliance.

## How do I fix CVE-2019-1672?

No fix has been published for CVE-2019-1672 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-1672 being exploited?

There is no known exploitation of CVE-2019-1672 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Web Security Appliance

- [CVE-2015-6298](https://insights.sbomify.com/CVE-2015-6298/): Command injection in n/a (critical 9.0)
- [CVE-2019-1817](https://insights.sbomify.com/CVE-2019-1817/): Cisco Web Security Appliance Malformed Request Denial of Service Vulnerability (high 8.6)
- [CVE-2018-0410](https://insights.sbomify.com/CVE-2018-0410/): Denial of service in AsyncOS Software for Cisco Web Security Appliances (high 8.6)
- [CVE-2015-6292](https://insights.sbomify.com/CVE-2015-6292/): Denial of service in n/a (high 7.8)
- [CVE-2015-6293](https://insights.sbomify.com/CVE-2015-6293/): Denial of service in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-1672 and fix it if it is affected.

What it is: CVE-2019-1672 is a medium-severity vulnerability in Cisco Web Security Appliance, published on 8 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-1672 in the wild and no public exploit code.

Affected product: Cisco Web Security 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-2019-1672/ (Markdown: https://insights.sbomify.com/CVE-2019-1672/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-1672
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-1672
- OSV: https://osv.dev/vulnerability/CVE-2019-1672

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-1672/
Summaries are generated and may contain mistakes; the official description above is the record.