Is CVE-2025-4092 in the CISA KEV catalog?

No. CVE-2025-4092 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-4092?

CVE-2025-4092 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2025-4092?

CVE-2025-4092 has an EPSS score of 0.26% (17th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-4092?

Upgrade firefox on debian unstable to 138.0-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2025-4092

MEDIUM

6.5

CVSS v3

NVD

Description

Memory safety bugs present in Firefox 137 and Thunderbird 137. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 138 and Thunderbird 138.

CWE-119Buffer Overflow

How to fix

Remediation Available

firefoxDebian

Fixed in:138.0-1CVE-2025-4092

thunderbirdUbuntu

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

DeveloperEditionWindows application

Affected:138.0Fixed in:138.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:138.0Fixed in:138.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:138.0Fixed in:138.0Mozilla

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

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.26%probability of exploitation in 30 days

17thpercentile

Low risk: more likely to be exploited than 17% of all known CVEs.

References

Vendor Advisory2

Other references1

bugzilla.mozilla.org

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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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.