CVE-2021-30858
ENISA EUVD: EUVD-2021-17775 ↗
Exploited in the Wild
✓ Confirmed 0-Day
★ Google Project Zero
Triaged: March 3, 2026
8 articles
Published: 2021-08-24
EPSS Score
Source: FIRST.org · 2026-05-23
0.79%
probability
This CVE has a 0.79% probability
of being exploited in the next 30 days.
0%
Top 74.2th percentile of all CVEs
100%
CVSS v3.1
Source: VulnerabilityLookup (CIRCL)8.8
HIGH
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v2 (legacy)
6.8
MEDIUM
Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
AV:N/AC:M/Au:N/C:P/I:P/A:P
Description
VulnerabilityLookup (CNA)A use after free issue was addressed with improved memory management. This issue is fixed in iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6. 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.
Affected Products
Apple
macOS
unspecified
Apple
iOS
unspecified
Attack Intelligence
CWE-118
· Incorrect Access of Indexable Resource ('Range Error')
CWE-119
· Buffer Overflow
CWE-416
· Use After Free
CWE-664
· Improper Control of a Resource Through its Lifetime
CWE-666
· Operation on Resource in Wrong Phase of Lifetime
CWE-672
· Operation on a Resource after Expiration or Release
CWE-825
· Expired Pointer Dereference
Google Project Zero
Patched
Sept. 13, 2021
Reported by
???
Root Cause Analysis
https://googleprojectzero.github.io/0days-in-the-wild//0day-RCAs/2021/CVE-2021-30858.html
Exploits & PoC
kmeps4/CVEREV3
Testing CVE-2021-30858 Rev3
1
2021-10-14
Jeromeyoung/ps4_8.00_vuln_poc
My take on CVE-2021-30858 for ps4 8.xx
0
2021-10-14
2 repos — triés par ⭐
Rechercher sur GitHub ↗
https://support.apple.com/en-us/HT212804
x_refsource_MISC
https://support.apple.com/en-us/HT212807
x_refsource_MISC
http://seclists.org/fulldisclosure/2021/Sep/27
mailing-list
x_refsource_FULLDISC
http://seclists.org/fulldisclosure/2021/Sep/25
mailing-list
x_refsource_FULLDISC
http://seclists.org/fulldisclosure/2021/Sep/29
mailing-list
x_refsource_FULLDISC
http://www.openwall.com/lists/oss-security/2021/09/20/1
mailing-list
x_refsource_MLIST
Signal Intelligence
Confidence
92%
EPSS
0.79%
CVSS v3.1
8.8
Mentions
8
Last Seen
Nov 09, 2021
CNA Information
CNA Assigner
apple
Analyst Note
CVE-2021-30858 is confirmed as a high-severity use-after-free vulnerability in Apple products with CVSS 8.8, actively exploited in the wild and reported by Google Project Zero. Apple's official patching across iOS, iPadOS, and macOS, combined with public exploitation evidence and CERT-EU advisory coverage, provides strong confirmation of this vulnerability's authenticity and impact.
Triage Info
Decided atMar 03, 2026
Published DateAug 24, 2021