Is CVE-2025-2857 in the CISA KEV catalog?

No. CVE-2025-2857 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-2857?

CVE-2025-2857 has a CVSS v3 base score of 10.0 (CRITICAL).

What is the EPSS score for CVE-2025-2857?

CVE-2025-2857 has an EPSS score of 1.89% (77th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-2857?

Upgrade DeveloperEdition to 136.0.4 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2025-2857

CRITICALEPSS 77th pctl

10.0

CVSS v3

NVD

Description

Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in our IPC code. A compromised child process could cause the parent process to return an unintentionally powerful handle, leading to a sandbox escape. The original vulnerability was being exploited in the wild. *This only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 136.0.4, Firefox ESR 128.8.1, and Firefox ESR 115.21.1.

CWE-668

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:136.0.4Fixed in:136.0.4Mozilla

Affected:115.21.1Fixed in:115.21.1Mozilla

Affected:128.1.0 128.8.1Fixed in:128.8.1Mozilla

Mozilla Firefox (en-US)Windows application

Affected:115.21.1Fixed in:115.21.1Mozilla

Affected:128.1.0 128.8.1Fixed in:128.8.1Mozilla

Affected:136.0.4Fixed in:136.0.4Mozilla

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.89%probability of exploitation in 30 days

77thpercentile

Elevated risk: more likely to be exploited than 77% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Third-Party Advisory1

cve.org

Other references2

Related Vulnerabilities

Other CWE-668 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-39952	Critical	9.8	100%	-	Fix
CVE-2017-16597	Critical	9.8	57%	-	-
CVE-2017-16603	High	8.8	54%	-	-
CVE-2024-25153	Critical	9.8	42%	-	Fix
CVE-2022-25236	Critical	9.8	36%	-	Fix
CVE-2017-0215	Medium	5.3	36%	-	-

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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.