# CVE-2020-3244: Cisco ASR 5000 Series Aggregation Services Routers Enhanced Charging Service Rule Bypass Vulnerability

> An unauthenticated remote attacker can bypass traffic classification rules on Cisco ASR 5000 routers by sending malformed HTTP requests, avoiding traffic charges.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:N/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Jun 2020
- **Updated:** 15 Nov 2024
- **Also known as:** GHSA-mp76-mqjp-pxx7

## What is CVE-2020-3244?

CVE-2020-3244 is a medium-severity vulnerability in Cisco ASR 5000 Series Software, published on 18 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the Enhanced Charging Service (ECS) functionality of Cisco ASR 5000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to bypass the traffic classification rules on an affected device. The vulnerability is due to insufficient input validation of user traffic going through an affected device. An attacker could exploit this vulnerability by sending a malformed HTTP request to an affected device. A successful exploit could allow the attacker to bypass the traffic classification rules and potentially avoid being charged for traffic consumption.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2020-3244?

It affects 1 product.


Products: Cisco Staros.

## How do I fix CVE-2020-3244?

No fix has been published for CVE-2020-3244 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3244 being exploited?

There is no known exploitation of CVE-2020-3244 in the wild and no public exploit code.

## Other vulnerabilities in Cisco ASR 5000 Series Software

- [CVE-2023-20046](https://insights.sbomify.com/CVE-2023-20046/): Auth bypass in Cisco ASR 5000 Series Software (high 8.8)
- [CVE-2019-1869](https://insights.sbomify.com/CVE-2019-1869/): Cisco StarOS Denial of Service Vulnerability (high 8.6)
- [CVE-2018-0369](https://insights.sbomify.com/CVE-2018-0369/): Denial of service in Cisco StarOS unknown (high 8.6)
- [CVE-2017-6707](https://insights.sbomify.com/CVE-2017-6707/): Command injection in Cisco StarOS (high 8.2)
- [CVE-2021-1539](https://insights.sbomify.com/CVE-2021-1539/): Cisco ASR 5000 Series Software Authorization Bypass Vulnerabilities (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-3244 and fix it if it is affected.

What it is: CVE-2020-3244 is a medium-severity vulnerability in Cisco ASR 5000 Series Software, published on 18 Jun 2020. 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-2020-3244 in the wild and no public exploit code.

Affected product: Cisco ASR 5000 Series 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-2020-3244/ (Markdown: https://insights.sbomify.com/CVE-2020-3244/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3244
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3244
- OSV: https://osv.dev/vulnerability/CVE-2020-3244

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-3244/
Summaries are generated and may contain mistakes; the official description above is the record.