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CVE-2024-7521

HIGH
8.8
CVSS Score
Published: August 6, 2024 at 12:38 PM UTC
Updated: June 17, 2026 at 08:20 AM UTC
3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity
HIGH8.8
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

Incomplete WebAssembly exception handing could have led to a use-after-free. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.

Affected

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

Firefox· Mozilla
95%
v < 129
Affected range stops below 129, so it looks safe — our inference, not a vendor statement
Affected range stops below 129.0, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
95%
v < 115.14v < 128.1128.0
Affected range stops below 115.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 115.14.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 128.1, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 115.14v < 128.1128.0.1
Affected range stops below 115.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 115.14.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 128.1, so it looks safe — our inference, not a vendor statement

References (6)

Issue TrackingPermissions Required
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1904644
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-33/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-34/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-35/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-37/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-38/

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

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

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-755

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