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CVE-2021-30663· NVD / CVE Program· CNA apple

An integer overflow was addressed with improved input validation.

An integer overflow was addressed with improved input validation. This issue is fixed in iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, Safari 14.1.1, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution.

HighCVSS 8.8 · v3.1KEVWeaponized Fix available
Published
Sep 8, 2021
Updated
Jun 16, 2026
EPSS
3.5% · 89th percentile
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Report tools

JSON

Action score

66

This week

Don’t wait for the next maintenance window.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
30 / 30 · Listed
EPSS
1 / 30 · 3.5%

CISA SSVC decision

Exploitation
active
Automatable
no
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

VendorProduct
applesafari
appleipados
appleiphone os
applemacos
appletvos

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apple ipados14.0 and later · before 14.5.1
  • apple iphone osbefore 12.5.3
  • apple iphone os14.0 and later · before 14.5.1
  • apple macos11.0 and later · before 11.3.1
  • apple safaribefore 14.1.1
  • apple tvosbefore 14.6

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 macOS

    • unspecified and later · before 11.3affected
    • unspecified and later · before 14.5affected
    • unspecified and later · before 12.5affected
    • unspecified and later · before 14.6affected
    • unspecified and later · before 14.1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8accountsservicebefore 0.6.55-2.el80.6.55-2.el8
AlmaLinux:8accountsservice-develbefore 0.6.55-2.el80.6.55-2.el8
AlmaLinux:8accountsservice-libsbefore 0.6.55-2.el80.6.55-2.el8
AlmaLinux:8gdmbefore 1:40.0-15.el81:40.0-15.el8
AlmaLinux:8gnome-autoarbefore 0.2.3-2.el80.2.3-2.el8
AlmaLinux:8gnome-calculatorbefore 3.28.2-2.el83.28.2-2.el8
AlmaLinux:8gnome-classic-sessionbefore 3.32.1-20.el83.32.1-20.el8
AlmaLinux:8gnome-control-centerbefore 3.28.2-28.el83.28.2-28.el8
AlmaLinux:8gnome-control-center-filesystembefore 3.28.2-28.el83.28.2-28.el8
AlmaLinux:8gnome-online-accountsbefore 3.28.2-3.el83.28.2-3.el8
AlmaLinux:8gnome-online-accounts-develbefore 3.28.2-3.el83.28.2-3.el8
AlmaLinux:8gnome-sessionbefore 3.28.1-13.el83.28.1-13.el8
AlmaLinux:8gnome-session-kiosk-sessionbefore 3.28.1-13.el83.28.1-13.el8
AlmaLinux:8gnome-session-wayland-sessionbefore 3.28.1-13.el83.28.1-13.el8
AlmaLinux:8gnome-session-xsessionbefore 3.28.1-13.el83.28.1-13.el8
AlmaLinux:8gnome-settings-daemonbefore 3.32.0-16.el8.alma3.32.0-16.el8.alma
AlmaLinux:8gnome-shellbefore 3.32.2-40.el83.32.2-40.el8
AlmaLinux:8gnome-shell-extension-apps-menubefore 3.32.1-20.el83.32.1-20.el8
AlmaLinux:8gnome-shell-extension-auto-move-windowsbefore 3.32.1-20.el83.32.1-20.el8
AlmaLinux:8gnome-shell-extension-commonbefore 3.32.1-20.el83.32.1-20.el8
AlmaLinux:8gnome-shell-extension-dash-to-dockbefore 3.32.1-20.el83.32.1-20.el8
AlmaLinux:8gnome-shell-extension-desktop-iconsbefore 3.32.1-20.el83.32.1-20.el8
AlmaLinux:8gnome-shell-extension-disable-screenshieldbefore 3.32.1-20.el83.32.1-20.el8
AlmaLinux:8gnome-shell-extension-drive-menubefore 3.32.1-20.el83.32.1-20.el8

+77

Same product

apple: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-28205A use after free issue was addressed with improved memory management.KEV
    73This week
  • CVE-2023-32439A type confusion issue was addressed with improved checks.KEV
    72This week
  • CVE-2023-32435A memory corruption issue was addressed with improved state management.KEV
    72This week
  • CVE-2025-24201An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions.KEV
    71This week
  • CVE-2023-37450The issue was addressed with improved checks.KEV
    71This week
  • CVE-2022-22620A use after free issue was addressed with improved memory management.KEV
    70This 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 / packageFixed versionSource
AlmaLinux:accountsservice0.6.55-2.el8 · AlmaLinux:8Package registry (OSV)
AlmaLinux:accountsservice-devel0.6.55-2.el8 · AlmaLinux:8Package registry (OSV)
AlmaLinux:accountsservice-libs0.6.55-2.el8 · AlmaLinux:8Package registry (OSV)
AlmaLinux:gdm1:40.0-15.el8 · AlmaLinux:8Package registry (OSV)
AlmaLinux:gnome-autoar0.2.3-2.el8 · AlmaLinux:8Package registry (OSV)
AlmaLinux:gnome-calculator3.28.2-2.el8 · AlmaLinux:8Package registry (OSV)
AlmaLinux:gnome-classic-session3.32.1-20.el8 · AlmaLinux:8Package registry (OSV)
AlmaLinux:gnome-control-center3.28.2-28.el8 · AlmaLinux:8Package registry (OSV)
AlmaLinux:gnome-control-center-filesystem3.28.2-28.el8 · AlmaLinux:8Package registry (OSV)
AlmaLinux:gnome-online-accounts3.28.2-3.el8 · AlmaLinux:8Package registry (OSV)
AlmaLinux:LibRaw0.19.5-3.el8 · AlmaLinux:8Package registry (OSV)
AlmaLinux:LibRaw-devel0.19.5-3.el8 · AlmaLinux:8Package registry (OSV)
Debian:webkit2gtk2.32.3-1 · Debian:12Package registry (OSV)
Debian:wpewebkit2.32.3-1 · Debian:12Package registry (OSV)
openSUSE:webkit2gtk32.32.3-lp152.2.16.1 · openSUSE:Leap 15.2Package registry (OSV)
Red Hat:LibRaw0:0.19.5-3.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
Red Hat:LibRaw-debuginfo0:0.19.5-3.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
Red Hat:LibRaw-debugsource0:0.19.5-3.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
Red Hat:webkit2gtk30:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
Red Hat:webkit2gtk3-debuginfo0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
Red Hat:webkit2gtk3-debugsource0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
Red Hat:webkit2gtk3-devel0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
Red Hat:webkit2gtk3-devel-debuginfo0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
Red Hat:webkit2gtk3-jsc0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
Red Hat:webkit2gtk3-jsc-debuginfo0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
Red Hat:webkit2gtk3-jsc-devel0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
Red Hat:webkit2gtk3-jsc-devel-debuginfo0:2.32.3-2.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
Rocky Linux:accountsservice0:0.6.55-2.el8 · Rocky Linux:8Package registry (OSV)
Rocky Linux:gdm1:40.0-15.el8 · Rocky Linux:8Package registry (OSV)
Rocky Linux:gnome-autoar0:0.2.3-2.el8 · Rocky Linux:8Package registry (OSV)

+11

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.

  1. Published
  2. CISA KEV+56 d
  3. TodaySep 29, 2026+1847 d
EPSS, last 120 days

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 researchers

Finders, 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.
  • A user must open a link or visit a page.
  • 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
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.

ATT&CK techniques

—

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 help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records