CVE-2014-1540

CVE-2014-1540 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.

Key facts

Description

Use-after-free vulnerability in the nsEventListenerManager::CompileEventHandlerInternal function in the Event Listener Manager in Mozilla Firefox before 30.0 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via crafted web content.

Frequently asked questions

What is CVE-2014-1540?
Use-after-free vulnerability in the nsEventListenerManager::CompileEventHandlerInternal function in the Event Listener Manager in Mozilla Firefox before 30.0 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via crafted web content.
How severe is CVE-2014-1540?
CVE-2014-1540 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2014-1540 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2014-1540?
CVE-2014-1540 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2014-1540?
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-2014-1540 published?
CVE-2014-1540 was published on 2014-06-11 and last updated on 2026-06-17.

References

Affected products (1)

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