CVE-2013-1054: The unity-firefox-extension package could be tricked into destroying the Unity webapps context, causing Firefo

Q: How do I fix CVE-2013-1054?

unity-firefox-extension: mitigate or apply the listed mitigation; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2013-1054 being exploited?

CVE-2013-1054 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2013-1054 affect?

CVE-2013-1054 affects unity-firefox-extension, ubuntu linux. Severity is medium (CVSS 4.3). The unity-firefox-extension package could be tricked into destroying the Unity webapps context, causing Firefox to crash. This could be achieved by spinning the event loop inside the webapps initialization callback. Fixed in 3.0.0+14.04.201

Q: How urgent is CVE-2013-1054?

Priority 43/100. Public exploit reference; On your watchlist

This month

MEDIUM 4.3WATCHLISTMITIGATEMITIGATE

CVE-2013-1054 is a medium-severity flaw (CVSS 4.3) affecting unity-firefox-extension, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The unity-firefox-extension package could be tricked into destroying the Unity webapps context, causing Firefox to crash. This could be achieved by spinning the event loop inside the webapps initialization callback. Fixed in 3.0.0+14.04.20140416-0ubuntu1.14.04.1 by shipping an empty package, thus disabling the extension entirely.

Why this priority

Public exploit reference
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-404
Published	2021-04-07
Last modified	2026-06-16

Publisher (CNA): Canonical Ltd. · Vendor: canonical

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-04-07 20:15 UTCPublished CVE record published
2026-06-16 23:50 UTCUpdated Record last modified

canonical unity-firefox-extension MITIGATE

Affected: < 3.0.0\+14.04.20140416-0ubuntu1.14.04.1

Fixed in: 3.0.0\+14.04.20140416-0ubuntu1.14.04.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy unity-firefox-extension || rpm -q unity-firefox-extension || unity-firefox-extension --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

canonical ubuntu linux MITIGATE

Affected: 14.04 · 15.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 14.04

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2013-1054?

unity-firefox-extension: mitigate or apply the listed mitigation; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2013-1054 being exploited?

CVE-2013-1054 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2013-1054 affect?

CVE-2013-1054 affects unity-firefox-extension, ubuntu linux. Severity is medium (CVSS 4.3). The unity-firefox-extension package could be tricked into destroying the Unity webapps context, causing Firefox to crash. This could be achieved by spinning the event loop inside the webapps initialization callback. Fixed in 3.0.0+14.04.201

How urgent is CVE-2013-1054?

Priority 43/100. Public exploit reference; On your watchlist

Software pages

Ubuntu vulnerabilities · Mozilla Firefox vulnerabilities · Unity vulnerabilities

Related CVEs

CVE-2013-1055 MEDIUM 4.3 MITIGATE MITIGATE The unity-firefox-extension package could be tricked into dropping a C callback which was still in use, which
CVE-2012-0960 HIGH 7.5 UPGRADE Unity integration extension (unity-firefox-extension) before 2.4.1 for Firefox does not properly handle callba
CVE-2012-0958 MEDIUM 4.3 DOWNGRADE content/unity-api.js in the unity-firefox-extension extension 2.4.1 for Firefox exposes the toDataURL function

References

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