Is CVE-2025-1018 in the CISA KEV catalog?

No. CVE-2025-1018 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-1018?

CVE-2025-1018 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2025-1018?

CVE-2025-1018 has an EPSS score of 0.40% (32th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-1018?

Upgrade firefox on debian unstable to 135.0-1 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2025-1018

MEDIUM

5.3

CVSS v3

NVD

Description

The fullscreen notification is prematurely hidden when fullscreen is re-requested quickly by the user. This could have been leveraged to perform a potential spoofing attack. This vulnerability was fixed in Firefox 135 and Thunderbird 135.

CWE-1021

How to fix

Remediation Available

firefoxDebian

Fixed in:135.0-1CVE-2025-1018

firefoxUbuntu

Fixed in:135.0+build2-0ubuntu0.20.04.1USN-7263-1

thunderbirdUbuntu

Fixed in:1:140.7.1+build1-0ubuntu0.22.04.1USN-7991-1

DeveloperEditionWindows application

Affected:135.0Fixed in:135.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:135.0Fixed in:135.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:131.0 135.0Fixed in:135.0Mozilla

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

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Exploit Intelligence

0.40%probability of exploitation in 30 days

32ndpercentile

Low risk: more likely to be exploited than 32% of all known CVEs.

References

Vendor Advisory2

Other references1

bugzilla.mozilla.org

Related Vulnerabilities

Other CWE-1021 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-21132	Critical	9.6	23%	-	Fix
CVE-2011-1244	Medium	5.8	15%	-	-
CVE-2013-2682	Medium	4.3	6.3%	-	-
CVE-2021-21139	Medium	6.5	4.7%	-	Fix
CVE-2017-11290	Medium	6.1	3.0%	-	-
CVE-2008-2716	Medium	5.0	3.0%	-	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 2026-04-13.