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CVE-2024-6603

Memory corruption in thread creation

HIGH
7.4
CVSS Score
Published: July 9, 2024 at 02:25 PM UTC
Updated: June 17, 2026 at 08:18 AM UTC
3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity
HIGH7.4
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

In an out-of-memory scenario an allocation could fail but free would have been called on the pointer afterwards leading to memory corruption. This vulnerability affects Firefox < 128, Firefox ESR < 115.13, Thunderbird < 115.13, and Thunderbird < 128.

Affected

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

Firefox· Mozilla
95%
v < 115.13v < 128v < 128.0
Affected range stops below 115.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 128, so it looks safe — our inference, not a vendor statement
Affected range stops below 128.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 115.13v < 128116.0 ≤ v < 128.0
Affected range stops below 115.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 128, so it looks safe — our inference, not a vendor statement
Affected range stops below 128.0, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
60%
v < 115.13
Affected range stops below 115.13, so it looks safe — our inference, not a vendor statement

References (5)

Issue Tracking
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1895081
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-29/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-30/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-31/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-32/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

7.4HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-823

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