CVE-2016-5259

Name: CVE-2016-5259
Creator: NVD / NIST
Published: 2016-08-05T01:59:15.097+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.29%

Last modified Jun 17, 2026

CVE-2016-5259 is a vulnerability of currently unknown severity. Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 allows remote attackers to execute arbitrary code via a script that closes its own Service Worker within a nested sync event loop.. EPSS estimates a 3.29% chance of exploitation in the next 30 days.

Description

Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 allows remote attackers to execute arbitrary code via a script that closes its own Service Worker within a nested sync event loop.

Metrics

EPSS Probability

3.29%

86.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	<= 47.0.1
Mozilla	Firefox	45.1.0
Mozilla	Firefox	45.1.1
Mozilla	Firefox	45.2.0
Mozilla	Firefox	45.3.0
Oracle	Linux	5.0
Oracle	Linux	6
Oracle	Linux	7

References

Timeline

Published: Aug 5, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-5259?

How severe is CVE-2016-5259?

Severity scoring for CVE-2016-5259 is pending analysis. The EPSS model estimates a 3.29% probability of exploitation in the next 30 days.

How do I fix CVE-2016-5259?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-5259?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST