How severe is CVE-2016-2811?

CVE-2016-2811 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-2811 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-2811?

CVE-2016-2811 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-2811?

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

When was CVE-2016-2811 published?

CVE-2016-2811 was published on 2016-04-30 and last updated on 2026-06-17.

CVE-2016-2811

CVE-2016-2811 is a high-severity vulnerability in Mozilla Firefox with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Mozilla Firefox
Published: 2016-04-30
Last modified: 2026-06-17

Description

Use-after-free vulnerability in the ServiceWorkerInfo class in the Service Worker subsystem in Mozilla Firefox before 46.0 allows remote attackers to execute arbitrary code via vectors related to the BeginReading method.

Frequently asked questions

What is CVE-2016-2811?: Use-after-free vulnerability in the ServiceWorkerInfo class in the Service Worker subsystem in Mozilla Firefox before 46.0 allows remote attackers to execute arbitrary code via vectors related to the BeginReading method.
How severe is CVE-2016-2811?: CVE-2016-2811 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-2811 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-2811?: CVE-2016-2811 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-2811?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-2811 published?: CVE-2016-2811 was published on 2016-04-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

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