CVE-2015-4495KEV · OVERDUE

Mozilla Firefox Security Feature Bypass Vulnerability

High · published August 8, 2015

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.8. It is confirmed in active exploitation. It sits in the 99.3th percentile for exploit probability.

1591
days past CISA
deadline
CVSS v3.1
8.8
EPSS
69%
Percentile
99.3
In the wild
Confirmed
What it is

🚨 A crafty JavaScript exploit can sneak past Firefox's defenses! This vulnerability lets attackers read any file on your system without a password. 🔥 Think of it like a hotel concierge who hands out room keys without verifying who’s asking; anyone could waltz into your room and grab your valuables. In this case, the Same Origin Policy is your key barrier, and the flaw lets attackers bypass it. If exploited, this could allow attackers to read sensitive files or even gain elevated privileges on your system, potentially leading to devastating data breaches. Imagine a malicious script rummaging through your documents without your knowledge—absolutely chilling!

Put simply

Think of it like a hotel concierge who hands out room keys without verifying who’s asking; anyone could waltz into your room and grab your valuables. In this case, the Same Origin Policy is your key barrier, and the flaw lets attackers bypass it. This vulnerability in the PDF reader of Mozilla Firefox prior to version 39.0.3 allows remote attackers to use crafted JavaScript code with a native setter to bypass the Same Origin Policy, thereby accessing arbitrary files.

What to do

If exploited, this could allow attackers to read sensitive files or even gain elevated privileges on your system, potentially leading to devastating data breaches. Imagine a malicious script rummaging through your documents without your knowledge—absolutely chilling! Update your Firefox browser to version 39.0.3 or later, and if you’re using Firefox ESR, ensure it’s updated to version 38.1.1. Regularly check for any updates, as keeping software current is your best defense! You've got this! Stay vigilant and keep your software updated to protect your digital fortress! 🛡️

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.68558 · 99.3th percentile
Published
2015-08-08T00:00Z
KEV added
2022-05-25 · due 2022-06-15
EPSS history
Timeline
  • 25 MAY 00:00Z
    Added to CISA KEV — remediate by Jun 15
    kev
  • 08 AUG 00:00Z
    The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypass the Same Origin…
    cvelistv5