CVE-2021-29968
When drawing text onto a canvas with WebRender disabled, an out of bounds read could occur. *This...
When drawing text onto a canvas with WebRender disabled, an out of bounds read could occur. This bug only affects Firefox on Windows. Other operating systems are unaffected.. This vulnerability affects Firefox < 89.0.1.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
When drawing text onto a canvas with WebRender disabled, an out of bounds read could occur. This bug only affects Firefox on Windows. Other operating systems are unaffected.. This vulnerability affects Firefox < 89.0.1.
- Record
CVE-2021-29968- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H - CVSS 2.0
- 5.8 Medium
AV:N/AC:M/Au:N/C:P/I:N/A:P - Weakness
- CWE-125
- Updated
- 2026-11-02
CVE List No score
When drawing text onto a canvas with WebRender disabled, an out of bounds read could occur. This bug only affects Firefox on Windows. Other operating systems are unaffected.. This vulnerability affects Firefox < 89.0.1.
- Record
CVE-2021-29968- Updated
- 2026-11-02
EUVDEUVD-2021-16427 No score
When drawing text onto a canvas with WebRender disabled, an out of bounds read could occur. This bug only affects Firefox on Windows. Other operating systems are unaffected.. This vulnerability affects Firefox < 89.0.1.
- Record
EUVD-2021-16427- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-88p3-h3gw-7xj6 No score
When drawing text onto a canvas with WebRender disabled, an out of bounds read could occur. *This...
When drawing text onto a canvas with WebRender disabled, an out of bounds read could occur. This bug only affects Firefox on Windows. Other operating systems are unaffected.. This vulnerability affects Firefox < 89.0.1.
- Record
GHSA-88p3-h3gw-7xj6- Weakness
- CWE-125
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-29968 is a high vulnerability (CVSS 8.1) in Mozilla Firefox, published June 24, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.83%, the 57th percentile. No source names a fixed version.