# CVE-2020-3571: Cisco Firepower 4110 ICMP Flood Denial of Service Vulnerability

> Remote attackers can cause a denial of service on Cisco Firepower 4110 appliances by sending crafted ICMP packets, leading to memory exhaustion and device reload.

- **Severity:** High 8.6 (`CVSS:3.0/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:** 21 Oct 2020
- **Updated:** 13 Nov 2024
- **Also known as:** GHSA-m34w-pwwr-wfrf

## What is CVE-2020-3571?

CVE-2020-3571 is a high-severity denial of service vulnerability in Cisco Secure Firewall Threat Defense, published on 21 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the ICMP ingress packet processing of Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 4110 appliances could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to incomplete input validation upon receiving ICMP packets. An attacker could exploit this vulnerability by sending a high number of crafted ICMP or ICMPv6 packets to an affected device. A successful exploit could allow the attacker to cause a memory exhaustion condition that may result in an unexpected reload. No manual intervention is needed to recover the device after the reload.

Weakness: CWE-20 (Improper Input Validation), CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2020-3571?

It affects 1 product.


Products: Cisco Secure Firewall Threat Defense.

## How do I fix CVE-2020-3571?

No fix has been published for CVE-2020-3571 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3571 being exploited?

There is no known exploitation of CVE-2020-3571 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Secure Firewall Threat Defense

- [CVE-2024-20412](https://insights.sbomify.com/CVE-2024-20412/): Hardcoded credentials in Cisco Firepower Threat Defense Software (critical 9.3)
- [CVE-2024-20330](https://insights.sbomify.com/CVE-2024-20330/): Memory corruption in Cisco Firepower Threat Defense Software (high 8.6)
- [CVE-2024-20339](https://insights.sbomify.com/CVE-2024-20339/): Cisco Firepower Threat Defense Software for Firepower 2100 Series TLS Denial of Service Vulnerability (high 8.6)
- [CVE-2024-20351](https://insights.sbomify.com/CVE-2024-20351/): Cisco Firepower Threat Defense Software Snort Firewall Denial of Service Vulnerability (high 8.6)
- [CVE-2023-20083](https://insights.sbomify.com/CVE-2023-20083/): Denial of service in Cisco Firepower Threat Defense Software (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-3571 and fix it if it is affected.

What it is: CVE-2020-3571 is a high-severity denial of service vulnerability in Cisco Secure Firewall Threat Defense, published on 21 Oct 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-2020-3571 in the wild and no public exploit code.

Affected product: Cisco Secure Firewall Threat Defense. 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-2020-3571/ (Markdown: https://insights.sbomify.com/CVE-2020-3571/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3571
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3571
- OSV: https://osv.dev/vulnerability/CVE-2020-3571

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-3571/
Summaries are generated and may contain mistakes; the official description above is the record.