CVE-2016-9900

Q: How do I fix CVE-2016-9900?

Published advisories record a fix for 6 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Q: Is CVE-2016-9900 being actively exploited?

Not that we know of. CVE-2016-9900 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 9.9% is the estimated probability that it will be exploited in the next 30 days. That is higher than 95% of all scored CVEs.

Q: How severe is CVE-2016-9900?

CVE-2016-9900 has a CVSS v3 base score of 7.5, 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.

Q: What does CVE-2016-9900 affect?

Published advisories record a fix for firefox (Debian), firefox (Ubuntu), thunderbird (Ubuntu), DeveloperEdition (Windows application), and 2 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGHEPSS 95th pctl

7.5

CVSS v3

NVD

Description

External resources that should be blocked when loaded by SVG images can bypass security restrictions through the use of "data:" URLs. This could allow for cross-domain data leakage. This vulnerability affects Firefox < 50.1, Firefox ESR < 45.6, and Thunderbird < 45.6.

CWE-254

How to fix

Remediation Available

firefoxDebian

Fixed in:50.1.0-1CVE-2016-9900

firefoxUbuntu

Fixed in:50.1.0+build2-0ubuntu0.14.04.1USN-3155-1

Fixed in:50.1.0+build2-0ubuntu0.16.04.1USN-3155-1

thunderbirdUbuntu

Fixed in:1:45.7.0+build1-0ubuntu0.14.04.1USN-3165-1

Fixed in:1:45.7.0+build1-0ubuntu0.16.04.1USN-3165-1

DeveloperEditionWindows application

Affected:50.1Fixed in:50.1Mozilla

Affected:45.6.0Fixed in:45.6.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:45.6.0Fixed in:45.6.0Mozilla

Affected:50.1Fixed in:50.1Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:45.6.0Fixed in:45.6.0Mozilla

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 v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

9.93%probability of exploitation in 30 days

95thpercentile

Very high risk: more likely to be exploited than 95% of all known CVEs.

References

Patch1

bugzilla.mozilla.org

Vendor Advisory3

Third-Party Advisory6

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-2016-9900?

Published advisories record a fix for 6 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2016-9900 being actively exploited?

Not that we know of. CVE-2016-9900 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 9.9% is the estimated probability that it will be exploited in the next 30 days. That is higher than 95% of all scored CVEs.

How severe is CVE-2016-9900?

CVE-2016-9900 has a CVSS v3 base score of 7.5, 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-2016-9900 affect?

Published advisories record a fix for firefox (Debian), firefox (Ubuntu), thunderbird (Ubuntu), DeveloperEdition (Windows application), and 2 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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 2025-11-25.