Is CVE-2018-12395 in the CISA KEV catalog?

No. CVE-2018-12395 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-12395?

CVE-2018-12395 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2018-12395?

CVE-2018-12395 has an EPSS score of 2.85% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-12395?

Upgrade firefox on debian unstable to 63.0-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2018-12395

HIGHEPSS 85th pctl

7.5

CVSS v3

NVD

Description

By rewriting the Host: request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.

How to fix

Remediation Available

firefoxDebian

Fixed in:63.0-1CVE-2018-12395

firefoxUbuntu

Fixed in:63.0+build2-0ubuntu0.14.04.2USN-3801-1

Fixed in:63.0+build2-0ubuntu0.16.04.2USN-3801-1

Fixed in:63.0+build2-0ubuntu0.18.04.2USN-3801-1

DeveloperEditionWindows application

Affected:63.0Fixed in:63.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:63.0Fixed in:63.0Mozilla

Mozilla Firefox ESR (en-US)Windows application

Affected:60.3Fixed in:60.3Mozilla

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

2.85%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Vendor Advisory3

Third-Party Advisory8

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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 2024-11-21.