CVE-2015-4516
HIGHEPSS 88th pctlDescription
Mozilla Firefox before 41.0 allows remote attackers to bypass certain ECMAScript 5 (aka ES5) API protection mechanisms and modify immutable properties, and consequently execute arbitrary JavaScript code with chrome privileges, via a crafted web page that does not use ES5 APIs.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v2 Vector
No CVSS vector data available.
Exploit Intelligence
Elevated risk: more likely to be exploited than 88% of all known CVEs.
References
Related Vulnerabilities
Other CWE-254 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2016-0161 | Medium | 6.5 | 69% | - | - |
| CVE-2016-2296 | Critical | 9.4 | 64% | - | - |
| CVE-2015-1793 | Medium | 6.5 | 62% | - | Fix |
| CVE-2016-2118 | High | 7.5 | 37% | - | Fix |
| CVE-2016-3238 | High | 8.1 | 35% | - | - |
| CVE-2016-3198 | Medium | 6.5 | 32% | - | - |
Common questions
How do I fix CVE-2015-4516?
Upgrade firefox on ubuntu 14.04 to 41.0+build3-0ubuntu0.14.04.1 or later.
Is CVE-2015-4516 being actively exploited?
Not that we know of. CVE-2015-4516 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 3.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 88% of all scored CVEs.
How severe is CVE-2015-4516?
CVE-2015-4516 has a CVSS v2 base score of 9.3, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2015-4516 affect?
Published advisories record a fix for firefox (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2015-4516
Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.