Is CVE-2025-4082 in the CISA KEV catalog?

No. CVE-2025-4082 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-4082?

CVE-2025-4082 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2025-4082?

CVE-2025-4082 has an EPSS score of 0.38% (30th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-4082?

Upgrade DeveloperEdition to 138.0 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2025-4082

MEDIUM

5.9

CVSS v3

NVD

Description

Modification of specific WebGL shader attributes could trigger an out-of-bounds read, which, when chained with other vulnerabilities, could be used to escalate privileges. *This bug only affects Thunderbird for macOS. Other versions of Thunderbird are unaffected.*. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:138.0Fixed in:138.0Mozilla

Affected:115.23Fixed in:115.23Mozilla

Affected:128.0 128.10Fixed in:128.10Mozilla

Mozilla Firefox (en-US)Windows application

Affected:138.0Fixed in:138.0Mozilla

Affected:115.23Fixed in:115.23Mozilla

Affected:128.0 128.10Fixed in:128.10Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:128.10.0Fixed in:128.10.0Mozilla

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.38%probability of exploitation in 30 days

30thpercentile

Low risk: more likely to be exploited than 30% of all known CVEs.

References

Vendor Advisory5

Other references2

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	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.