CVE-2021-30858
Confirmed PUBLISHEDA 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....
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Aug 24, 2021
- Exploitation Reported
- Nov 03, 2021
- CVSS
- 8.8 High
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Apple |
macOS
|
unspecified to < 11.6 |
Affected |
| Apple |
iOS
|
unspecified to < 14.8 |
Affected |
CVE References
- FEDORA-2021-c00e45b6c0 lists.fedoraproject.org · Vendor Advisory https://lists.fedoraproject.org/archives/list/package-announce%40list...
- DSA-4975 debian.org · Vendor Advisory https://www.debian.org/security/2021/dsa-4975
- DSA-4976 debian.org · Vendor Advisory https://www.debian.org/security/2021/dsa-4976
- FEDORA-2021-edf6957b7d lists.fedoraproject.org · Vendor Advisory https://lists.fedoraproject.org/archives/list/package-announce%40list...
- 20210917 APPLE-SA-2021-09-13-3 macOS Big Sur 11.6 seclists.org · Mailing List http://seclists.org/fulldisclosure/2021/Sep/27
Show 13 more references
- 20210917 APPLE-SA-2021-09-13-1 iOS 14.8 and iPadOS 14.8 seclists.org · Mailing List http://seclists.org/fulldisclosure/2021/Sep/25
- 20210917 APPLE-SA-2021-09-13-5 Safari 14.1.2 seclists.org · Mailing List http://seclists.org/fulldisclosure/2021/Sep/29
- [oss-security] 20210920 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0005 openwall.com · Mailing List http://www.openwall.com/lists/oss-security/2021/09/20/1
- 20210921 APPLE-SA-2021-09-20-6 Additional information for APPLE-SA-2021-09-13-1 iOS 14.8 and iPadOS 14.8 seclists.org · Mailing List http://seclists.org/fulldisclosure/2021/Sep/38
- 20210921 APPLE-SA-2021-09-20-7 Additional information for APPLE-SA-2021-09-13-3 macOS Big Sur 11.6 seclists.org · Mailing List http://seclists.org/fulldisclosure/2021/Sep/39
- 20210924 APPLE-SA-2021-09-23-1 iOS 12.5.5 seclists.org · Mailing List http://seclists.org/fulldisclosure/2021/Sep/50
- [oss-security] 20211026 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006 openwall.com · Mailing List http://www.openwall.com/lists/oss-security/2021/10/26/9
- [oss-security] 20211027 Re: WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006 openwall.com · Mailing List http://www.openwall.com/lists/oss-security/2021/10/27/1
- [oss-security] 20211027 Re: WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006 openwall.com · Mailing List http://www.openwall.com/lists/oss-security/2021/10/27/2
- [oss-security] 20211027 Re: WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006 openwall.com · Mailing List http://www.openwall.com/lists/oss-security/2021/10/27/4
- support.apple.com/en-us/HT212804 support.apple.com · CVE Record https://support.apple.com/en-us/HT212804
- support.apple.com/en-us/HT212807 support.apple.com · CVE Record https://support.apple.com/en-us/HT212807
- support.apple.com/kb/HT212824 support.apple.com · CVE Record https://support.apple.com/kb/HT212824
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2021-11-03 00:00 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AV:N/AC:M/Au:N/C:P/I:P/A:P
Exploitation Status
Exploited in the wild
Recorded 2021-11-03 00:00:00 UTC · CISA
Weaknesses (CWE)
-
Use After Free
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC over 4 years ago00:00 UTC · over 4 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
18:49 UTC almost 5 years ago18:49 UTC · almost 5 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC over 5 years ago00:00 UTC · over 5 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2021-30858
{
"cve_id": "CVE-2021-30858",
"title": "A use after free issue was addressed with improved memory management. This is...",
"affected_vendor": "Apple",
"affected_product": "macOS, iOS",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 8.8,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}