# CVE-2024-20474: Integer overflow in Cisco Secure Client

> An unauthenticated remote attacker can cause a denial of service in Cisco Secure Client by sending a crafted IKEv2 packet that triggers an integer underflow.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L`)
- **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:** 23 Oct 2024
- **Updated:** 23 Oct 2024
- **Also known as:** GHSA-f5rp-4vg3-xcrx

## What is CVE-2024-20474?

CVE-2024-20474 is a medium-severity vulnerability in Cisco Anyconnect Secure Mobility Client, published on 23 Oct 2024. 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

A vulnerability in Internet Key Exchange version 2 (IKEv2) processing of Cisco Secure Client Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) of Cisco Secure Client.

 This vulnerability is due to an integer underflow condition. An attacker could exploit this vulnerability by sending a crafted IKEv2 packet to an affected system. A successful exploit could allow the attacker to cause Cisco Secure Client Software to crash, resulting in a DoS condition on the client software.

 Note: Cisco Secure Client Software releases 4.10 and earlier were known as Cisco AnyConnect Secure Mobility Client.

Weakness: CWE-191 (Integer Underflow (Wrap or Wraparound))

## Which versions are affected by CVE-2024-20474?

It affects 2 products.


Products: Cisco Anyconnect Secure Mobility Client, Cisco Secure Client.

## How do I fix CVE-2024-20474?

No fix has been published for CVE-2024-20474 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-20474 being exploited?

There is no known exploitation of CVE-2024-20474 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-2024-20474 and fix it if it is affected.

What it is: CVE-2024-20474 is a medium-severity vulnerability in Cisco Anyconnect Secure Mobility Client, published on 23 Oct 2024. 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-2024-20474 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-2024-20474/ (Markdown: https://insights.sbomify.com/CVE-2024-20474/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-20474
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-20474
- OSV: https://osv.dev/vulnerability/CVE-2024-20474

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-20474/
Summaries are generated and may contain mistakes; the official description above is the record.