CVE-2023-6204
MEDIUM
6.5
CVSS Score
Published: November 21, 2023 at 02:28 PM UTC
Updated: June 17, 2026 at 06:50 AM UTC
4 products affected across 2 vendorsDebian LinuxFirefoxThunderbird
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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.8%
Description
On some systems—depending on the graphics settings and drivers—it was possible to force an out-of-bounds read and leak memory data into the images created on the canvas element. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Debian Linux· Debiandrupal
95%v < 120
Affected range stops below 120, so it looks safe — our inference, not a vendor statement
Affected range stops below 120.0, so it looks safe — our inference, not a vendor statement
v < 115.5.0
Affected range stops below 115.5.0, so it looks safe — our inference, not a vendor statement
v < 115.5
Affected range stops below 115.5, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (7)
Issue TrackingPermissions Required
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1841050Release NotesVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2023-49/Release NotesVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2023-50/Release NotesVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2023-52/CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- NONE
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-125
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