# CVE-2013-5559: Memory corruption in n/a

> Remote attackers can execute arbitrary code via a crafted HTML document due to a buffer overflow in the Cisco AnyConnect VPN client.

- **Severity:** Medium 6.8 (`AV:N/AC:M/Au:N/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 4 Nov 2013
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-pqr5-xvxq-fp5h

## What is CVE-2013-5559?

CVE-2013-5559 is a medium-severity memory corruption vulnerability in Cisco Anyconnect Secure Mobility Client, published on 4 Nov 2013. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Buffer overflow in the Active Template Library (ATL) framework in the VPNAPI COM module in Cisco AnyConnect Secure Mobility Client 2.x allows user-assisted remote attackers to execute arbitrary code via a crafted HTML document, aka Bug ID CSCuj58139.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2013-5559?

It affects 1 product.


Products: Cisco Anyconnect Secure Mobility Client.

## How do I fix CVE-2013-5559?

No fix has been published for CVE-2013-5559 yet. Limit exposure of the affected software until one is available.

## Is CVE-2013-5559 being exploited?

There is no known exploitation of CVE-2013-5559 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-2013-5559 and fix it if it is affected.

What it is: CVE-2013-5559 is a medium-severity memory corruption vulnerability in Cisco Anyconnect Secure Mobility Client, published on 4 Nov 2013. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2013-5559 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-2013-5559/ (Markdown: https://insights.sbomify.com/CVE-2013-5559/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2013-5559
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2013-5559
- OSV: https://osv.dev/vulnerability/CVE-2013-5559

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From sbomify Insights: https://insights.sbomify.com/CVE-2013-5559/
Summaries are generated and may contain mistakes; the official description above is the record.