CVE-2021-1834
CRITICAL
9.8
CVSS Score
Published: September 8, 2021 at 02:43 PM UTC
Updated: June 17, 2026 at 03:32 AM UTC
1 product affected across 1 vendormacOS
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Severity
CRITICAL9.8
Exploit prediction
EPSS 3%
Description
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina, Security Update 2021-003 Mojave. A malicious application may be able to execute arbitrary code with kernel privileges.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 11.3v < 202111.0 ≤ v < 11.310.1410.14.010.14.110.14.210.14.310.14.410.14.4 beta410.14.510.14.610.14.6 security_update_2019-110.14.6 security_update_2019-210.14.6 security_update_2019-410.14.6 security_update_2019-510.14.6 security_update_2019-610.14.6 security_update_2019-710.14.6 security_update_2020-110.14.6 security_update_2020-210.14.6 security_update_2020-310.14.6 security_update_2020-410.14.6 security_update_2020-510.14.6 security_update_2020-610.14.6 security_update_2020-710.14.6 security_update_2021-110.14.6 security_update_2021-210.1510.15.110.15.210.15.310.15.410.15.510.15.610.15.6 supplemental_update10.15.710.15.7 security_update_202010.15.7 security_update_2020-110.15.7 security_update_2020-510.15.7 security_update_2020-710.15.7 security_update_2021-1
Affected range stops below 11.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 2021, 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 (3)
CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-787
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