CVE-2021-1791 json
An out-of-bounds read issue existed that led to the disclosure of kernel memory.
published 2021-04-02 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-7255
- cvss
- 5.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 68%
- public exploits
- 0
- none known
Summary
An out-of-bounds read issue existed that led to the disclosure of kernel memory. This was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. A malicious application may be able to disclose kernel memory.
Patch / fix
- Apple iOS and iPadOS 14.4
- Apple macOS 7.3, 11.2, 14.4
Exploit prediction
1.21% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 7.1 | AV:N/AC:M/Au:N/C:C/I:N/A:N |
Affected products
- Apple iOS and iPadOS
- Apple macOS
Classification
- Weakness
-
- CWE-125 Out-of-bounds Read
References
-
support.apple.com
/en-us/HT212147
release-notes, vendor-advisory
-
support.apple.com
/en-us/HT212146
release-notes, vendor-advisory
-
support.apple.com
/en-us/HT212148
release-notes, vendor-advisory
-
support.apple.com
/en-us/HT212149
release-notes, vendor-advisory
Sources
- CVE List CVE-2021-1791
- NVD CVE-2021-1791
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.