A logic issue was addressed with improved restrictions.
A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
- Published
- Apr 2, 2021
- Updated
- Jun 16, 2026
- EPSS
- 7.0% · 94th percentile
- CWE
- —
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Report tools
Action score
71
This week
Don’t wait for the next maintenance window.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 30 / 30 · Listed
- EPSS
- 2 / 30 · 7.0%
CISA SSVC decision
- Exploitation
- active
- Automatable
- yes
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
Actively exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on Nov 3, 2021. That signals real attacks, not theory.
Remediation deadline for government agencies: Nov 17, 2021.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| apple | ipados | cpe:2.3:o:apple:ipados |
| apple | iphone os | cpe:2.3:o:apple:iphone_os |
| apple | mac os x | cpe:2.3:o:apple:mac_os_x |
| apple | macos | cpe:2.3:o:apple:macos |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apple ipadosbefore 14.4
- apple iphone osbefore 14.4
- apple mac os x10.15 and later · before 10.15.7
- apple mac os x10.15.7
- apple macos11.0.1 and later · before 11.2
- debian debian linux10.0
- fedoraproject fedora33
Versions reported by the vendor
Affected version ranges reported by the assigning authority (apple). Independent of NVD's CPE analysis and usually ahead of it.
Apple iOS and iPadOS
- unspecified and later · before 14.4affected
Apple macOS
- unspecified and later · before 11.2affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | accountsservice | before 0.6.55-2.el8 | 0.6.55-2.el8 |
| AlmaLinux:8 | accountsservice-devel | before 0.6.55-2.el8 | 0.6.55-2.el8 |
| AlmaLinux:8 | accountsservice-libs | before 0.6.55-2.el8 | 0.6.55-2.el8 |
| AlmaLinux:8 | gdm | before 1:40.0-15.el8 | 1:40.0-15.el8 |
| AlmaLinux:8 | gnome-autoar | before 0.2.3-2.el8 | 0.2.3-2.el8 |
| AlmaLinux:8 | gnome-calculator | before 3.28.2-2.el8 | 3.28.2-2.el8 |
| AlmaLinux:8 | gnome-classic-session | before 3.32.1-20.el8 | 3.32.1-20.el8 |
| AlmaLinux:8 | gnome-control-center | before 3.28.2-28.el8 | 3.28.2-28.el8 |
| AlmaLinux:8 | gnome-control-center-filesystem | before 3.28.2-28.el8 | 3.28.2-28.el8 |
| AlmaLinux:8 | gnome-online-accounts | before 3.28.2-3.el8 | 3.28.2-3.el8 |
| AlmaLinux:8 | gnome-online-accounts-devel | before 3.28.2-3.el8 | 3.28.2-3.el8 |
| AlmaLinux:8 | gnome-session | before 3.28.1-13.el8 | 3.28.1-13.el8 |
| AlmaLinux:8 | gnome-session-kiosk-session | before 3.28.1-13.el8 | 3.28.1-13.el8 |
| AlmaLinux:8 | gnome-session-wayland-session | before 3.28.1-13.el8 | 3.28.1-13.el8 |
| AlmaLinux:8 | gnome-session-xsession | before 3.28.1-13.el8 | 3.28.1-13.el8 |
| AlmaLinux:8 | gnome-settings-daemon | before 3.32.0-16.el8.alma | 3.32.0-16.el8.alma |
| AlmaLinux:8 | gnome-shell | before 3.32.2-40.el8 | 3.32.2-40.el8 |
| AlmaLinux:8 | gnome-shell-extension-apps-menu | before 3.32.1-20.el8 | 3.32.1-20.el8 |
| AlmaLinux:8 | gnome-shell-extension-auto-move-windows | before 3.32.1-20.el8 | 3.32.1-20.el8 |
| AlmaLinux:8 | gnome-shell-extension-common | before 3.32.1-20.el8 | 3.32.1-20.el8 |
| AlmaLinux:8 | gnome-shell-extension-dash-to-dock | before 3.32.1-20.el8 | 3.32.1-20.el8 |
| AlmaLinux:8 | gnome-shell-extension-desktop-icons | before 3.32.1-20.el8 | 3.32.1-20.el8 |
| AlmaLinux:8 | gnome-shell-extension-disable-screenshield | before 3.32.1-20.el8 | 3.32.1-20.el8 |
| AlmaLinux:8 | gnome-shell-extension-drive-menu | before 3.32.1-20.el8 | 3.32.1-20.el8 |
+75
Same product
apple: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-30860An integer overflow was addressed with improved input validation.KEV84Now
- CVE-2025-43300An out-of-bounds write issue was addressed with improved bounds checking.KEV80Now
- CVE-2023-41064A buffer overflow issue was addressed with improved memory handling.KEV77This week
- CVE-2023-32434An integer overflow was addressed with improved input validation.KEV76This week
- CVE-2025-24085A use after free issue was addressed with improved memory management.KEV75This week
- CVE-2023-41993The issue was addressed with improved checks.KEV72This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:accountsservice | 0.6.55-2.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:accountsservice-devel | 0.6.55-2.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:accountsservice-libs | 0.6.55-2.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:gdm | 1:40.0-15.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:gnome-autoar | 0.2.3-2.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:gnome-calculator | 3.28.2-2.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:gnome-classic-session | 3.32.1-20.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:gnome-control-center | 3.28.2-28.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:gnome-control-center-filesystem | 3.28.2-28.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:gnome-online-accounts | 3.28.2-3.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:LibRaw | 0.19.5-3.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:LibRaw-devel | 0.19.5-3.el8 · AlmaLinux:8 | Package registry (OSV) |
| debian:webkit2gtk | 2.32.0-2 · Debian:12 | Package registry (OSV) |
| debian:wpewebkit | 2.32.0-2 · Debian:12 | Package registry (OSV) |
| opensuse:webkit2gtk3 | 2.32.0-lp152.2.13.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| red hat:LibRaw | 0:0.19.5-3.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:LibRaw-debuginfo | 0:0.19.5-3.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:LibRaw-debugsource | 0:0.19.5-3.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:webkit2gtk3 | 0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:webkit2gtk3-debuginfo | 0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:webkit2gtk3-debugsource | 0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:webkit2gtk3-devel | 0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:webkit2gtk3-devel-debuginfo | 0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:webkit2gtk3-jsc | 0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:webkit2gtk3-jsc-debuginfo | 0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:webkit2gtk3-jsc-devel | 0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:webkit2gtk3-jsc-devel-debuginfo | 0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| rocky linux:accountsservice | 0:0.6.55-2.el8 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:gdm | 1:40.0-15.el8 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:gnome-autoar | 0:0.2.3-2.el8 · Rocky Linux:8 | Package registry (OSV) |
+10
Exploit status
Weaponized
A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- CISA KEV+214 d
- TodaySep 30, 2026+2007 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
- support.apple.com/en-us/HT212146
- support.apple.com/en-us/HT212147
- www.debian.org/security/2021/dsa-4923
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1871
Vendor advisories and official records. Exploit/PoC links are deliberately left out.