CVE-2021-1871 KEV
9.8
CRITICAL · CVSS 3.1 · EPSS 7% (pctl 94)
Patch first
On CISA KEV — known exploited in the wild, due 2021-11-17.
Description
A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 7% — more likely to be exploited than 94% of all CVEs |
| On CISA KEV | yes — remediate by 2021-11-17 |
| Public exploit | none known |
| Published | 2021-04-02 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Apple iOS, iPadOS, and macOS WebKit Remote Code Execution Vulnerability |
|---|---|
| Added | 2021-11-03 |
| Due | 2021-11-17 |
| Vendor / product | Apple / iOS, iPadOS, and macOS |
| Ransomware use | none reported |
Affected (6)
| Vendor | Product |
|---|---|
| apple | ipados |
| apple | iphone os |
| apple | mac os x |
| apple | macos |
| debian | debian linux |
| fedoraproject | fedora |
References
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
- https://support.apple.com/en-us/HT212146
- https://support.apple.com/en-us/HT212147
- https://www.debian.org/security/2021/dsa-4923
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
- https://support.apple.com/en-us/HT212146
- https://support.apple.com/en-us/HT212147
- https://www.debian.org/security/2021/dsa-4923
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1871
→ the Explorer · watch your stack · NVD