# CVE-2024-20308: Memory corruption in Cisco IOS XE Software

> Unauthenticated remote attackers can cause a heap underflow and device reload via crafted IKEv1 packets, resulting in denial of service.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Mar 2024
- **Updated:** 26 Nov 2024
- **Also known as:** GHSA-6vwv-6hmx-54hh

## What is CVE-2024-20308?

CVE-2024-20308 is a high-severity memory corruption vulnerability in Cisco Ios, published on 27 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the IKEv1 fragmentation code of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a heap underflow, resulting in an affected device reloading.

 This vulnerability exists because crafted, fragmented IKEv1 packets are not properly reassembled. An attacker could exploit this vulnerability by sending crafted UDP packets to an affected system. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition.

 Note: Only traffic that is directed to the affected system can be used to exploit this vulnerability. This vulnerability can be triggered by IPv4 and IPv6 traffic..

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2024-20308?

It affects 2 products.


Products: Cisco Ios, Cisco Ios Xe.

## How do I fix CVE-2024-20308?

No fix has been published for CVE-2024-20308 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-20308 being exploited?

There is no known exploitation of CVE-2024-20308 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Ios

- [CVE-2017-12240](https://insights.sbomify.com/CVE-2017-12240/): Cisco IOS and IOS XE Software DHCP Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2017-3881](https://insights.sbomify.com/CVE-2017-3881/): Cisco IOS and IOS XE Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2018-0167](https://insights.sbomify.com/CVE-2018-0167/): Cisco IOS, XR, and XE Software Buffer Overflow (high 8.8, exploited in the wild)
- [CVE-2017-6736](https://insights.sbomify.com/CVE-2017-6736/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2017-6737](https://insights.sbomify.com/CVE-2017-6737/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-20308 and fix it if it is affected.

What it is: CVE-2024-20308 is a high-severity memory corruption vulnerability in Cisco Ios, published on 27 Mar 2024. 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-2024-20308 in the wild and no public exploit code.

Affected product: Cisco Ios. 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-2024-20308/ (Markdown: https://insights.sbomify.com/CVE-2024-20308/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-20308
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-20308
- OSV: https://osv.dev/vulnerability/CVE-2024-20308

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-20308/
Summaries are generated and may contain mistakes; the official description above is the record.