CVE-2021-29968 json
When drawing text onto a canvas with WebRender disabled, an out of bounds read could occur.
published 2021-06-24 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-16427
- cvss
- 8.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 57%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Mozilla Firefox 89.0.1
Exploit prediction
0.83% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H |
| NVD | 2.0 | 5.8 | AV:N/AC:M/Au:N/C:P/I:N/A:P |
Affected products
- Mozilla Firefox
Classification
- Weakness
-
- CWE-125 Out-of-bounds Read
References
-
mozilla.org
/security/advisories/mfsa2021-27/
release-notes, vendor-advisory
-
bugzilla.mozilla.org
/show_bug.cgi?id=1712047
issue-tracking, permissions-required, vendor-advisory
Sources
- CVE List CVE-2021-29968
- NVD CVE-2021-29968
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