# CVE-2021-20216: privoxy: A flaw was found in Privoxy in versions before 3.0.31

CVE-2021-20216 is fixed in privoxy on 1 platform, first by privoxy 3.0.26-5ubuntu0.1, released March 9, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-20216
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0228
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 4, 2021

## Description

A flaw was found in Privoxy in versions before 3.0.31. A memory leak that occurs when decompression fails unexpectedly may lead to a denial of service. The highest threat from this vulnerability is to system availability.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | privoxy Ubuntu 18.04.6 LTS (bionic) | 3.0.26-5ubuntu0.1 | [privoxy 3.0.26-5ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-privoxy-3.0.26-5ubuntu0.1.md) | Mar 9, 2021 |
| Linux | privoxy Ubuntu 20.04 LTS (focal) | 3.0.28-2ubuntu0.1 | [privoxy 3.0.28-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-privoxy-3.0.28-2ubuntu0.1.md) | Mar 9, 2021 |

---

Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.