CVE-2025-3030

Memory safety bugs fixed in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9

HIGH
8.1
CVSS Score
Published: April 1, 2025 at 12:29 PM UTC
Updated: October 5, 2026 at 03:10 PM UTC
2 products affected across 1 vendorFirefoxThunderbird

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Severity
HIGH8.1
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

Memory safety bugs present in Firefox 136, Thunderbird 136, Firefox ESR 128.8, and Thunderbird 128.8. 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 affects Firefox < 137, Firefox ESR < 128.9, Thunderbird < 137, and Thunderbird < 128.9.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 128.8.0v < 136.0
Affected range stops below 128.8.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 128.9 (unaffected)
Affected range stops below 136.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 137 (unaffected)
v < 128.8.0129.0 ≤ v < 136.0
Affected range stops below 128.8.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 128.9 (unaffected)
Affected range stops below 136.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 137 (unaffected)

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-416

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