# CVE-2017-6751: Auth bypass in Cisco Web Security Appliance

> Unauthenticated remote attackers can bypass access controls to forward traffic to the administrative management interface of Cisco WSA devices.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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:** 25 Jul 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-78hh-rj37-p22v

## What is CVE-2017-6751?

CVE-2017-6751 is a high-severity authentication bypass vulnerability in Cisco Web Security Appliance, published on 25 Jul 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the web proxy functionality of the Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to forward traffic from the web proxy interface of an affected device to the administrative management interface of an affected device, aka an Access Control Bypass Vulnerability. Affected Products: virtual and hardware versions of Cisco Web Security Appliance (WSA). More Information: CSCvd88863. Known Affected Releases: 10.1.0-204 9.0.0-485.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2017-6751?

It affects 2 products.


Products: Cisco Web Security Appliance, Cisco Web Security Virtual Appliance.

## How do I fix CVE-2017-6751?

No fix has been published for CVE-2017-6751 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-6751 being exploited?

There is no known exploitation of CVE-2017-6751 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-2017-6751 and fix it if it is affected.

What it is: CVE-2017-6751 is a high-severity authentication bypass vulnerability in Cisco Web Security Appliance, published on 25 Jul 2017. 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-2017-6751 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-2017-6751/ (Markdown: https://insights.sbomify.com/CVE-2017-6751/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-6751
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-6751
- OSV: https://osv.dev/vulnerability/CVE-2017-6751

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-6751/
Summaries are generated and may contain mistakes; the official description above is the record.