# CVE-2020-3315: Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass Vulnerability

> Remote attackers can bypass file policies in Cisco Snort engines via crafted HTTP packets, delivering malicious payloads to protected networks.

- **Severity:** Medium 5.8 (`CVSS:3.0/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:** Yes
- **Published:** 6 May 2020
- **Updated:** 15 Nov 2024
- **Also known as:** GHSA-m4mg-49c8-xj46, UBUNTU-CVE-2020-3315

## What is CVE-2020-3315?

CVE-2020-3315 is a medium-severity vulnerability in Cisco Ios, published on 6 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Multiple Cisco products are affected by a vulnerability in the Snort detection engine that could allow an unauthenticated, remote attacker to bypass the configured file policies on an affected system. The vulnerability is due to errors in how the Snort detection engine handles specific HTTP responses. An attacker could exploit this vulnerability by sending crafted HTTP packets that would flow through an affected system. A successful exploit could allow the attacker to bypass the configured file policies and deliver a malicious payload to the protected network.

Weakness: CWE-668 (Exposure of Resource to Wrong Sphere), CWE-693 (Protection Mechanism Failure)

## Which versions are affected by CVE-2020-3315?

It affects 3 products.


Products: Cisco Ios, Cisco Secure Firewall Management Center, Cisco Secure Firewall Threat Defense.

## How do I fix CVE-2020-3315?

Apply the vendor's patch.

## Is CVE-2020-3315 being exploited?

There is no known exploitation of CVE-2020-3315 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-2020-3315 and fix it if it is affected.

What it is: CVE-2020-3315 is a medium-severity vulnerability in Cisco Ios, published on 6 May 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-2020-3315 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-2020-3315/ (Markdown: https://insights.sbomify.com/CVE-2020-3315/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3315
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3315
- OSV: https://osv.dev/vulnerability/CVE-2020-3315

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-3315/
Summaries are generated and may contain mistakes; the official description above is the record.