Vulnerability details

CVE-2025-4093

Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10

CVSS 3.1

8.1High

Official description

Memory safety bug present in Firefox ESR 128.9, and Thunderbird 128.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 128.10 and Thunderbird 128.10.

CVSS scores

Score	Version	Source	Vector
8.1High	3.1	CISA ADP / Vulnrichment (CISA-ADP)	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
No product information recorded.

References and advisories

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Details

Published: 2025-04-29
Last updated: 2026-04-13
State: Published
Assigner (CNA): mozilla

Exploit prediction (EPSS)

0.49%

Probability of exploitation in 30 days

42.4%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer