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ExploitedIn CISA KEVFix available

CVE-2021-30661

Exploitation confirmed. First attested on 2021-11-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2021-09-08
  • Fixed in14.5 · 12.5.3
  • WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. 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..

Timeline

dates in UTC
  1. 2021-09-0815:15CVE publishedNVD
  2. 2021-11-03Added to the CISA KEV catalogCISA KEV
  3. 2021-11-03Listed as exploited by GCVEGCVE
  4. 2021-11-03Exploitation first reportedCISA KEV
  5. 2025-01-2917:25SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-30661?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-30661?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Apple iphone os
BranchAffectedFixed in
14.x≥ 14.0, < 14.514.5
12.5< 12.5.312.5.3
Apple ipados
BranchAffectedFixed in
14.5< 14.514.5
Apple macos
BranchAffectedFixed in
11.x≥ 11.0, < 11.311.3

3 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA6 products

As apple, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Apple iOS and iPadOS
    Affected
    • < 14.5fixed in 14.5custom
  • Apple Safari
    Affected
    • < 14.1fixed in 14.1custom
  • Apple tvOS
    Affected
    • < 14.5fixed in 14.5custom
  • Apple watchOS
    Affected
    • < 7.4fixed in 7.4custom
  • Apple macOS
    Affected
    • < 11.3fixed in 11.3custom
  • Apple macOS
    Affected
    • < 12.5fixed in 12.5custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2021-09-08

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • accountsserviceRocky Linux:8all versions · fixed in 0:0.6.55-1.el8
  • accountsservice-develAlmaLinux:8all versions · fixed in 0.6.55-1.el8
  • atkmmRocky Linux:8all versions · fixed in 0:2.24.2-7.el8
  • atkmmAlmaLinux:8all versions · fixed in 2.24.2-7.el8and 2 other packages
  • cairommRocky Linux:8all versions · fixed in 0:1.12.0-8.el8
  • cairommAlmaLinux:8all versions · fixed in 1.12.0-8.el8and 2 other packages
  • chrome-gnome-shellRocky Linux:8all versions · fixed in 0:10.1-7.el8
  • chrome-gnome-shellAlmaLinux:8all versions · fixed in 10.1-7.el8

128 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-30661 Red Hat Product Security70 products fixed · 9 known affected

    webkitgtk: Use-after-free leading to arbitrary code execution

    webkitgtk as a component of Red Hat Enterprise Linux 6 · webkitgtk-devel as a component of Red Hat Enterprise Linux 6 · webkitgtk-doc as a component of Red Hat Enterprise Linux 6 · +6 more

  • RHSA-2025:10364 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: webkitgtk4 security update

  • RHSA-2021:1586 Red Hat Product Security46 products fixed

    Red Hat Security Advisory: GNOME security, bug fix, and enhancement update

Full record on NVD

Fix

  1. Update Apple iphone os to 14.5 · 12.5.3
  2. CISA’s required action: Apply updates per vendor instructions.due 2021-11-17
  3. Vendor fix Red Hat Product Security RHSA-2025:10364 · 13 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  4. Vendor fix Red Hat Product Security CVE-2021-30661 · 46 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.
  5. No fix available, says the vendor Red Hat Product Security CVE-2021-30661 · 9 productsAffected

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2021-11-03
Patch Due Date
2021-11-17
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2021-09-08
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-79qq-9x66-f5r5

Frequently asked questions

What is CVE-2021-30661?

A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. 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..

Is CVE-2021-30661 actively exploited?

Yes. CVE-2021-30661 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2021-11-17.

What is the CVSS score for CVE-2021-30661?

CVE-2021-30661 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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