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CVE-2023-4577

MEDIUM6.5

Memory corruption in JIT UpdateRegExpStatics

Published Sep 11, 2023

Modified 4 weeks ago

Fix available

Details

When UpdateRegExpStatics attempted to access initialStringHeap it could already have been garbage collected prior to entering the function, which could potentially have led to an exploitable crash. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 115.2.

Affected Packages

Ubuntu:14.04:LTSFirefox

Fixed in:

117

Ubuntu:16.04:LTSFirefox

Fixed in:

117

Ubuntu:18.04:LTSFirefox

Fixed in:

117

Ubuntu:20.04:LTSFirefox

Fixed in:

117

Ubuntu:22.04:LTSFirefox

Fixed in:

117

Ubuntu:24.04:LTSFirefox

Fixed in:

117

Ubuntu:25.04Firefox

Fixed in:

117

Ubuntu:25.10Firefox

Fixed in:

117

Windows:10240Mozilla Firefox

Fixed in:

117

Windows:10240Mozilla Firefox ESR

Fixed in:

115.2

Windows:14393Mozilla Firefox

Fixed in:

117

Windows:14393Mozilla Firefox ESR

Fixed in:

115.2

Windows:17763Mozilla Firefox

Fixed in:

117

Windows:17763Mozilla Firefox ESR

Fixed in:

115.2

Windows:18362Mozilla Firefox

Fixed in:

117

Windows:18362Mozilla Firefox ESR

Fixed in:

115.2

Windows:18363Mozilla Firefox

Fixed in:

117

Windows:18363Mozilla Firefox ESR

Fixed in:

115.2

Windows:19041Mozilla Firefox

Fixed in:

117

Windows:19041Mozilla Firefox ESR

Fixed in:

115.2

Windows:19042Mozilla Firefox

Fixed in:

117

Windows:19042Mozilla Firefox ESR

Fixed in:

115.2

Windows:19043Mozilla Firefox

Fixed in:

117

Windows:19043Mozilla Firefox ESR

Fixed in:

115.2

Windows:19044Mozilla Firefox

Fixed in:

117

Windows:19044Mozilla Firefox ESR

Fixed in:

115.2

Windows:19045Mozilla Firefox

Fixed in:

117

Windows:19045Mozilla Firefox ESR

Fixed in:

115.2

Windows:20348Mozilla Firefox

Fixed in:

117

Windows:20348Mozilla Firefox ESR

Fixed in:

115.2

Windows:22000Mozilla Firefox

Fixed in:

117

Windows:22000Mozilla Firefox ESR

Fixed in:

115.2

Windows:22621Mozilla Firefox

Fixed in:

117

Windows:22621Mozilla Firefox ESR

Fixed in:

115.2

Windows:22631Mozilla Firefox

Fixed in:

117

Windows:22631Mozilla Firefox ESR

Fixed in:

115.2

Windows:25398Mozilla Firefox

Fixed in:

117

Windows:25398Mozilla Firefox ESR

Fixed in:

115.2

Windows:26100Mozilla Firefox

Fixed in:

117

Windows:26100Mozilla Firefox ESR

Fixed in:

115.2

Windows:26200Mozilla Firefox

Fixed in:

117

Windows:26200Mozilla Firefox ESR

Fixed in:

115.2

macOS:14Firefox

Fixed in:

117

macOS:14Firefox ESR

Fixed in:

115.2

macOS:15Firefox

Fixed in:

117

macOS:15Firefox ESR

Fixed in:

115.2

macOS:26Firefox

Fixed in:

117

macOS:26Firefox ESR

Fixed in:

115.2

References

WEBhttps://bugzilla.mozilla.org/show_bug.cgi?id=1847397 ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2023-4577 WEBhttps://www.mozilla.org/security/advisories/mfsa2023-34/WEBhttps://www.mozilla.org/security/advisories/mfsa2023-36/WEBhttps://www.mozilla.org/security/advisories/mfsa2023-38/

CVSS Analysis

CVSS v3.1

6.5

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

RequiredUI:R

Scope

Scope

UnchangedS:U

Impact

Confidentiality

NoneC:N

Integrity

NoneI:N

Availability

HighA:H

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

Timeline

PublishedSep 11, 2023

ModifiedDec 18, 2025

CVE-2023-4577 | Mondoo Vulnerability Intelligence