high Known exploitedREV. 01
CVE-2021-30952Apple Safari — integer overflow in web content to code execution
An integer overflow in Apple's web content handling, fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS and iPadOS 15.2 and watchOS 8.3, lets a crafted page run code on the device.
Read the risk
THE VITAL STATS- CVSS score
- 7.8/ 10 CVSS v3.1
- EPSS probability
- 7% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2021-08-24
- Added to KEV
- 2026-03-05
- Exploit published
- Yes
- Confidence
- high
- Kill chain
- execution
- MITRE ATT&CK
- T1203
- Severity
- high
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attacker needsThe user must open attacker-controlled web content in an affected browser.
Fixed inSafari 15.2, iOS 15.2, iPadOS 15.2, macOS Monterey 12.1, tvOS 15.2, watchOS 8.3
Behind the card
5 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisorysupport.apple.comsupport.apple.com
- 04Vendor advisorysupport.apple.comsupport.apple.com
- 05Vendor advisorysupport.apple.comsupport.apple.com
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-24 | claude-code | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.