CVE-2021-30666 KEV
8.8
HIGH · CVSS 3.1 · EPSS 3% (pctl 87)
Patch first
On CISA KEV — known exploited in the wild, due 2021-11-17.
Description
A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 12.5.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
Scoring
| CVSS | 8.8 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| EPSS | 3% — more likely to be exploited than 87% of all CVEs |
| Weakness | CWE-119 |
| On CISA KEV | yes — remediate by 2021-11-17 |
| Public exploit | none known |
| Published | 2021-09-08 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Apple iOS WebKit Buffer Overflow Vulnerability |
|---|---|
| Added | 2021-11-03 |
| Due | 2021-11-17 |
| Vendor / product | Apple / iOS |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| apple | iphone os |
References
→ the Explorer · watch your stack · NVD