CVE-2013-1055Public exploitNetwork attack vector

Firefox crash via premature callback release

Published Apr 7, 2021 · Updated Sep 16, 2024

Resource-release error in Canonical unity-firefox-extension and libunity-webapps allows remote attackers to crash Firefox via crafted web content. The extension drops a C callback that remains in use, and Firefox then frees it after launcher-action updates reach the libunity-webapps rate limit. Exploitation requires user interaction with attacker-controlled content and only interrupts the affected Firefox process.

CVSS severity4.3
Medium
EPSS probability1.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource-release error in Canonical unity-firefox-extension and libunity-webapps allows remote attackers to crash Firefox via crafted web content. The extension drops a C callback that remains in use, and Firefox then frees it after launcher-action updates reach the libunity-webapps rate limit. Exploitation requires user interaction with attacker-controlled content and only interrupts the affected Firefox process.

The record

CVE
CVE-2013-1055
Published
Apr 7, 2021
Updated
Sep 16, 2024
Vendor
Canonical
Product
libunity-webapps
Classifications
CWE-404, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.5.0 <2.5.0~+14.04.20140409-0ubuntu1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Canonical · libunity-webappsversion=2.5.0 <2.5.0~+14.04.20140409-0ubuntu1
Canonical · unity-firefox-extensionversion=3.0.0 <3.0.0+14.04.20140416-0ubuntu1.14.04.1

Published CVSS scores

4.3Canonical Ltd.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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