CVE-2013-0756

Use-after-free vulnerability in the obj_toSource function in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 17.x before 17.0.2, and SeaMonkey before 2.15 allows remote attackers to execute arbitrary code via a crafted web page referencing JavaScript Proxy objects that are not properly handled during garbage collection.

Published: 2013-01-13 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-0756 is rated High Risk (65.4/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.38%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2013-0756

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-07-17 0.99% 1.38% +0.39%
2 2025-07-09 0.53% 0.99% +0.45%
3 2025-03-30 — 0.53% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-0756

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.3 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 10.0 [email protected]

Weakness enumeration for CVE-2013-0756

OS Trackers for CVE-2013-0756

vendor priority summary link
gentoo high CVE-2013-0756: 1 GLSA(s) (201309-23), 6 atom(s) (mail-client/thunderbird, mail-client/thunderbird-bin, www-client/firefox, www-client/firefox-bin, www-client/seamonkey, www-client/seamonkey-bin); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-0756
redhat critical — https://access.redhat.com/security/cve/CVE-2013-0756
suse medium CVE-2013-0756 severity moderate: SUSE including 85 source package names (MozillaFirefox, MozillaFirefox-10.0.12-0.4.1, …), 165 product×package rows across 45 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 6, … (45 product lines)): Fixed 134, Known Not Affected 31. https://www.suse.com/security/cve/CVE-2013-0756/
ubuntu medium CVE-2013-0756 medium priority: Ubuntu including 3 source packages (firefox, seamonkey, thunderbird), 24 status rows across 8 suites (hardy, lucid, oneiric, precise, quantal, raring, saucy, upstream): released 15, ignored 5, DNE 4. https://ubuntu.com/security/CVE-2013-0756

Affected software / configurations for CVE-2013-0756

Vendor Product Version Raw CPE
mozilla firefox < 17.0.2 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla firefox < 18.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla seamonkey < 2.15 cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
mozilla thunderbird < 17.0.2 cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
mozilla thunderbird_esr < 17.0.2 cpe:2.3:a:mozilla:thunderbird_esr:*:*:*:*:*:*:*:*
opensuse opensuse 11.4 cpe:2.3:o:opensuse:opensuse:11.4:*:*:*:*:*:*:*
opensuse opensuse 12.1 cpe:2.3:o:opensuse:opensuse:12.1:*:*:*:*:*:*:*
opensuse opensuse 12.2 cpe:2.3:o:opensuse:opensuse:12.2:*:*:*:*:*:*:*
suse linux_enterprise_desktop 10 cpe:2.3:o:suse:linux_enterprise_desktop:10:sp4:*:*:*:*:*:*
suse linux_enterprise_desktop 11 cpe:2.3:o:suse:linux_enterprise_desktop:11:sp2:*:*:*:*:*:*
suse linux_enterprise_server 10 cpe:2.3:o:suse:linux_enterprise_server:10:sp4:*:*:*:*:*:*
suse linux_enterprise_server 11 cpe:2.3:o:suse:linux_enterprise_server:11:sp2:*:*:*:-:*:*
suse linux_enterprise_server 11 cpe:2.3:o:suse:linux_enterprise_server:11:sp2:*:*:*:vmware:*:*
suse linux_enterprise_software_development_kit 10 cpe:2.3:o:suse:linux_enterprise_software_development_kit:10:sp4:*:*:*:*:*:*
suse linux_enterprise_software_development_kit 11 cpe:2.3:o:suse:linux_enterprise_software_development_kit:11:sp2:*:*:*:*:*:*
canonical ubuntu_linux 10.04 cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:-:*:*:*
canonical ubuntu_linux 11.10 cpe:2.3:o:canonical:ubuntu_linux:11.10:*:*:*:*:*:*:*
canonical ubuntu_linux 12.04 cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
canonical ubuntu_linux 12.10 cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:*

References for CVE-2013-0756

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00006.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00007.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00010.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00017.html Mailing List Third Party Advisory
http://www.mozilla.org/security/announce/2013/mfsa2013-19.html Vendor Advisory
http://www.ubuntu.com/usn/USN-1681-1 Third Party Advisory
http://www.ubuntu.com/usn/USN-1681-2 Third Party Advisory
http://www.ubuntu.com/usn/USN-1681-4 Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=814029 Issue Tracking Vendor Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A17101 Third Party Advisory
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