# CVE-2024-20315: Auth bypass in Cisco IOS XR Software

> Unauthenticated remote attackers can bypass configured Access Control Lists on MPLS interfaces, gaining unauthorized access to protected resources.

- **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:** 13 Mar 2024
- **Updated:** 15 Apr 2025
- **Also known as:** GHSA-v5qr-gm4v-2cgg

## What is CVE-2024-20315?

CVE-2024-20315 is a medium-severity authentication bypass vulnerability in Cisco IOS XR Software, published on 13 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 access control list (ACL) processing on MPLS interfaces in the ingress direction of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL.

 This vulnerability is due to improper assignment of lookup keys to internal interface contexts. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to access resources behind the affected device that were supposed to be protected by a configured ACL.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2024-20315?


## How do I fix CVE-2024-20315?

No fix has been published for CVE-2024-20315 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-20315 being exploited?

There is no known exploitation of CVE-2024-20315 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-20315 and fix it if it is affected.

What it is: CVE-2024-20315 is a medium-severity authentication bypass vulnerability in Cisco IOS XR Software, published on 13 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-2024-20315 in the wild and no public exploit code.

Affected product: Cisco IOS XR Software. 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-2024-20315/ (Markdown: https://insights.sbomify.com/CVE-2024-20315/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-20315
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-20315
- OSV: https://osv.dev/vulnerability/CVE-2024-20315

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-20315/
Summaries are generated and may contain mistakes; the official description above is the record.