---
title: "CVE-2020-3299\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2020-3299?format=md
keywords: index, follow
---

# CVE-2020-3299

Publication date 21 October 2020

Last updated 26 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**5.8 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2020-3299?format=md#impact-score)

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## Description

Multiple Cisco products are affected by a vulnerability in the Snort
detection engine that could allow an unauthenticated, remote attacker to
bypass a configured File Policy for HTTP. The vulnerability is due to
incorrect detection of modified HTTP packets used in chunked responses. An
attacker could exploit this vulnerability by sending crafted HTTP packets
through an affected device. A successful exploit could allow the attacker
to bypass a configured File Policy for HTTP packets and deliver a malicious
payload.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2020-3299?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| snort | 26.04 LTS resolute | Not in release |
| 25.10 questing | Not in release |
| 25.04 plucky | Not in release |
| 24.10 oracular | Not in release |
| 24.04 LTS noble | Not affected |
| 23.10 mantic | Not affected |
| 23.04 lunar | Not affected |
| 22.10 kinetic | Not affected |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 20.04 LTS focal | Vulnerable |
| 18.04 LTS bionic | Vulnerable |
| 16.04 LTS xenial | Vulnerable |
| 14.04 LTS trusty | Vulnerable |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [seth-arnold](https://launchpad.net/~seth-arnold)

"This is fixed in the open-source Snort project version 2.9.13.1 and later"

---

### [yomonokio](https://launchpad.net/~yomonokio)

There is no access to the actual fix for this CVE nor
workarounds that address this vulnerability

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.8 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Changed |
  | Confidentiality impact | None |
  | Integrity impact | Low |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.8 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3299)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2020-3299)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2020-3299)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2020-3299)

### Other references

* <https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-bypass-3eCfd24j>
* <https://www.cve.org/CVERecord?id=CVE-2020-3299>