How severe is CVE-2013-0787?

CVE-2013-0787 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2013-0787 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-0787?

CVE-2013-0787 primarily affects Mozilla Firefox. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-0787?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2013-0787 published?

CVE-2013-0787 was published on 2013-03-11 and last updated on 2026-06-16.

CVE-2013-0787

CVE-2013-0787 is a critical-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 6% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Mozilla Firefox
Published: 2013-03-11
Last modified: 2026-06-16

Description

Use-after-free vulnerability in the nsEditor::IsPreformatted function in editor/libeditor/base/nsEditor.cpp in Mozilla Firefox before 19.0.2, Firefox ESR 17.x before 17.0.4, Thunderbird before 17.0.4, Thunderbird ESR 17.x before 17.0.4, and SeaMonkey before 2.16.1 allows remote attackers to execute arbitrary code via vectors involving an execCommand call.

Frequently asked questions

What is CVE-2013-0787?: Use-after-free vulnerability in the nsEditor::IsPreformatted function in editor/libeditor/base/nsEditor.cpp in Mozilla Firefox before 19.0.2, Firefox ESR 17.x before 17.0.4, Thunderbird before 17.0.4, Thunderbird ESR 17.x before 17.0.4, and SeaMonkey before 2.16.1 allows remote attackers to execute arbitrary code via vectors involving an execCommand call.
How severe is CVE-2013-0787?: CVE-2013-0787 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2013-0787 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-0787?: CVE-2013-0787 primarily affects Mozilla Firefox. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-0787?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2013-0787 published?: CVE-2013-0787 was published on 2013-03-11 and last updated on 2026-06-16.

References

Affected products (20)

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:19.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:17.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:17.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:17.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:17.0.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:17.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird_esr:17.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird_esr:17.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird_esr:17.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird_esr:17.0.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.16:beta1:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.16:beta2:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.16:beta3:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.16:beta4:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:2.16:beta5:*:*:*:*:*:*

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Other CWE-399 (Resource Management Errors) vulnerabilities

CVE-2015-8104 — Critical (CVSS 10.0): The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a…
CVE-2015-0339 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
CVE-2014-0560 — Critical (CVSS 10.0): Use-after-free vulnerability in Adobe Reader and Acrobat 10.x before 10.1.12 and 11.x before 11.0.09 on Windows and OS…

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