---
title: "CVE-2015-8921\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-2015-8921?format=md
keywords: index, follow
---

# CVE-2015-8921

Publication date 31 December 2015

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2015-8921?format=md#impact-score)

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## Description

The ae\_strtofflags function in archive\_entry.c in libarchive before 3.2.0
allows remote attackers to cause a denial of service (out-of-bounds read)
via a crafted mtree file.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libarchive | 16.04 LTS xenial | Fixed 3.1.2-11ubuntu0.16.04.2 |
| 15.10 wily | Fixed 3.1.2-11ubuntu0.15.10.2 |
| 14.04 LTS trusty | Fixed 3.1.2-7ubuntu2.3 |
| 12.04 LTS precise | Fixed 3.0.3-6ubuntu1.3 |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2015-8921?format=md#patch-details)

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| libarchive | * Upstream:   [1cbc76f](https://github.com/libarchive/libarchive/commit/1cbc76faffb79a99c6009a1816736f73b4a3632a) * Upstream:   [05a875f](https://github.com/libarchive/libarchive/commit/05a875fdb876e7a2f56a2937f756927cbed919e0) * Upstream:   [9063237](https://github.com/libarchive/libarchive/commit/90632371f89d1390bf71dd31ae1c842b9110bea2) * Upstream:   [c600d11](https://github.com/libarchive/libarchive/commit/c600d11f2c1645f6f6965592659d386436f4d6db) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8921)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-8921)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-8921)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2015-8921)

### Related Ubuntu Security Notices (USN)

+ [USN-3033-1](https://usn.ubuntu.com/USN-3033-1)
+ libarchive vulnerabilities
+ 14 July 2016

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2015-8921>