Is CVE-2016-9900 in the CISA KEV catalog?

No. CVE-2016-9900 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-9900?

CVE-2016-9900 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2016-9900?

CVE-2016-9900 has an EPSS score of 9.93% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-9900?

Upgrade firefox on debian unstable to 50.1.0-1 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2016-9900

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

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

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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.