Is CVE-2018-12399 in the CISA KEV catalog?

No. CVE-2018-12399 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-12399?

CVE-2018-12399 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2018-12399?

CVE-2018-12399 has an EPSS score of 1.36% (68th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-12399?

Upgrade firefox on debian unstable to 63.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2018-12399

MEDIUM

4.3

CVSS v3

NVD

Description

When a new protocol handler is registered, the API accepts a title argument which can be used to mislead users about which domain is registering the new protocol. This may result in the user approving a protocol handler that they otherwise would not have. This vulnerability affects Firefox < 63.

CWE-287Improper Authentication

How to fix

Remediation Available

firefoxDebian

Fixed in:63.0-1CVE-2018-12399

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

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 InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

1.36%probability of exploitation in 30 days

68thpercentile

Moderate risk: more likely to be exploited than 68% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory3

Related Vulnerabilities

Other CWE-287 (Improper Authentication) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-35082	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-35078	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2017-7921	Critical	9.8	100%	KEV	-
CVE-2024-7593	Critical	9.8	100%	KEV	-
CVE-2023-46805	High	8.2	100%	KEV + Ransom	-
CVE-2022-40684	Critical	9.8	100%	KEV + Ransom	Fix

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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.