---
title: "CVE-2021-25802\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-2021-25802?format=md
keywords: index, follow
---

# CVE-2021-25802

Publication date 26 July 2021

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.1 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2021-25802?format=md#impact-score)

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## Description

A buffer overflow vulnerability in the AVI\_ExtractSubtitle component of
VideoLAN VLC Media Player 3.0.11 allows attackers to cause an out-of-bounds
read via a crafted .avi file.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| vlc | 25.04 plucky | Not affected |
| 24.10 oracular | Not affected |
| 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 |
| 21.04 hirsute | Not affected |
| 20.04 LTS focal | Fixed 3.0.9.2-1ubuntu0.1~esm1  Ubuntu Pro |
| 18.04 LTS bionic | Fixed 3.0.8-0ubuntu18.04.1+esm1  Ubuntu Pro |
| 16.04 LTS xenial | Fixed 2.2.2-5ubuntu0.16.04.5+esm2  Ubuntu Pro |
| 14.04 LTS trusty | Ignored end of standard support |

---

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

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## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.1 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Local |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | Required |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.1 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25802)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2021-25802)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2021-25802)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2021-25802)

### Related Ubuntu Security Notices (USN)

+ [USN-6180-1](https://usn.ubuntu.com/USN-6180-1)
+ VLC media player vulnerabilities
+ 20 June 2023

### Other references

* <https://code.videolan.org/videolan/vlc-3.0/-/commit/0660acc3ab64d2c3ad99cae887a438f0648faa72 (v3.0.12)>
* <https://code.videolan.org/videolan/vlc-3.0/-/commit/0660acc3ab64d2c3ad99cae887a438f0648faa72>
* <https://www.cve.org/CVERecord?id=CVE-2021-25802>