# CVE-2024-20465: Security feature bypass in IOS

> Unauthenticated remote attackers can bypass access control lists on Cisco Industrial Ethernet switches when Resilient Ethernet Protocol is toggled.

- **Severity:** Medium 5.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/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:** 25 Sep 2024
- **Updated:** 25 Sep 2024
- **Also known as:** GHSA-q728-88fr-65v3

## What is CVE-2024-20465?

CVE-2024-20465 is a medium-severity vulnerability in Cisco Ios, published on 25 Sep 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the access control list (ACL) programming of Cisco IOS Software running on Cisco Industrial Ethernet 4000, 4010, and 5000 Series Switches could allow an unauthenticated, remote attacker to bypass a configured ACL.

 This vulnerability is due to the incorrect handling of IPv4 ACLs on switched virtual interfaces when an administrator enables and disables Resilient Ethernet Protocol (REP). An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass an ACL on the affected device.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2024-20465?

It affects 1 product.


Products: Cisco Ios.

## How do I fix CVE-2024-20465?

No fix has been published for CVE-2024-20465 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-20465 being exploited?

There is no known exploitation of CVE-2024-20465 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-2024-20465 and fix it if it is affected.

What it is: CVE-2024-20465 is a medium-severity vulnerability in Cisco Ios, published on 25 Sep 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-2024-20465 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-2024-20465/ (Markdown: https://insights.sbomify.com/CVE-2024-20465/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-20465
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-20465
- OSV: https://osv.dev/vulnerability/CVE-2024-20465

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-20465/
Summaries are generated and may contain mistakes; the official description above is the record.