# CVE-2018-0334: Security feature bypass in Cisco AnyConnect Secure Mobility Client unknown

> Remote attackers can bypass TLS certificate validation to modify configuration profiles and localization data in Cisco AnyConnect clients.

- **Severity:** Medium 4.8 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/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:** 7 Jun 2018
- **Updated:** 29 Nov 2024
- **Also known as:** GHSA-4p6c-fxcr-rhm3

## What is CVE-2018-0334?

CVE-2018-0334 is a medium-severity vulnerability in Cisco Anyconnect Secure Mobility Client, published on 7 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the certificate management subsystem of Cisco AnyConnect Network Access Manager and of Cisco AnyConnect Secure Mobility Client for iOS, Mac OS X, Android, Windows, and Linux could allow an unauthenticated, remote attacker to bypass the TLS certificate check when downloading certain configuration files. The vulnerability is due to improper use of Simple Certificate Enrollment Protocol and improper server certificate validation. An attacker could exploit this vulnerability by preparing malicious profile and localization files for Cisco AnyConnect to use. A successful exploit could allow the attacker to remotely change the configuration profile, a certificate, or the localization data used by AnyConnect Secure Mobility Client. Cisco Bug IDs: CSCvh23141.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2018-0334?

It affects 1 product.


Products: Cisco Anyconnect Secure Mobility Client.

## How do I fix CVE-2018-0334?

No fix has been published for CVE-2018-0334 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-0334 being exploited?

There is no known exploitation of CVE-2018-0334 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Anyconnect Secure Mobility Client

- [CVE-2020-3433](https://insights.sbomify.com/CVE-2020-3433/): Cisco AnyConnect Secure Mobility Client for Windows DLL Hijacking (high 7.8, exploited in the wild)
- [CVE-2020-3153](https://insights.sbomify.com/CVE-2020-3153/): Cisco AnyConnect Secure Mobility Client for Windows Uncontrolled Search Path (medium 6.5, exploited in the wild)
- [CVE-2012-3088](https://insights.sbomify.com/CVE-2012-3088/): Security feature bypass in n/a (critical 9.3)
- [CVE-2012-2493](https://insights.sbomify.com/CVE-2012-2493/): Code injection in n/a (critical 9.3)
- [CVE-2011-2040](https://insights.sbomify.com/CVE-2011-2040/): Code injection in n/a (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-0334 and fix it if it is affected.

What it is: CVE-2018-0334 is a medium-severity vulnerability in Cisco Anyconnect Secure Mobility Client, published on 7 Jun 2018. 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-2018-0334 in the wild and no public exploit code.

Affected product: Cisco Anyconnect Secure Mobility Client. 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-2018-0334/ (Markdown: https://insights.sbomify.com/CVE-2018-0334/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-0334
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-0334
- OSV: https://osv.dev/vulnerability/CVE-2018-0334

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-0334/
Summaries are generated and may contain mistakes; the official description above is the record.