# CVE-2024-20319: Security feature bypass in Cisco IOS XR Software

> An unauthenticated adjacent attacker can bypass management plane protection to access the SNMP server on Cisco IOS XR devices.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Mar 2024
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-936v-x9xm-gc22

## What is CVE-2024-20319?

CVE-2024-20319 is a medium-severity vulnerability in Cisco Ios Xr, published on 13 Mar 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in the UDP forwarding code of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to bypass configured management plane protection policies and access the Simple Network Management Plane (SNMP) server of an affected device.

 This vulnerability is due to incorrect UDP forwarding programming when using SNMP with management plane protection. An attacker could exploit this vulnerability by attempting to perform an SNMP operation using broadcast as the destination address that could be processed by an affected device that is configured with an SNMP server. A successful exploit could allow the attacker to communicate to the device on the configured SNMP ports. Although an unauthenticated attacker could send UDP datagrams to the configured SNMP port, only an authenticated user can retrieve or modify data using SNMP requests.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2024-20319?

It affects 1 product.


Products: Cisco Ios Xr.

## How do I fix CVE-2024-20319?

No fix has been published for CVE-2024-20319 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-20319 being exploited?

There is no known exploitation of CVE-2024-20319 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Ios Xr

- [CVE-2020-3118](https://insights.sbomify.com/CVE-2020-3118/): Cisco IOS XR Software Discovery Protocol Format String (high 8.8, exploited in the wild)
- [CVE-2020-3569](https://insights.sbomify.com/CVE-2020-3569/): Cisco IOS XR Software DVMRP Memory Exhaustion (high 8.6, exploited in the wild)
- [CVE-2020-3566](https://insights.sbomify.com/CVE-2020-3566/): Cisco IOS XR Software DVMRP Memory Exhaustion (high 8.6, exploited in the wild)
- [CVE-2010-3035](https://insights.sbomify.com/CVE-2010-3035/): Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service (high 7.5, exploited in the wild)
- [CVE-2022-20821](https://insights.sbomify.com/CVE-2022-20821/): Cisco IOS XR Open Port (medium 6.5, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-20319 and fix it if it is affected.

What it is: CVE-2024-20319 is a medium-severity vulnerability in Cisco Ios Xr, published on 13 Mar 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-20319 in the wild and no public exploit code.

Affected product: Cisco Ios Xr. 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-2024-20319/ (Markdown: https://insights.sbomify.com/CVE-2024-20319/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-20319
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-20319
- OSV: https://osv.dev/vulnerability/CVE-2024-20319

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-20319/
Summaries are generated and may contain mistakes; the official description above is the record.