TI-2021-01581 Aliases CVE-2021-1879 GHSA-qhqp-qw35-f96r

Cross-site scripting in Apple iOS and iPadOS

HIGH 84Exploited in the wildCWE-79Published 2021-04-02 · Updated 2025-10-21

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

This issue was addressed by improved management of object lifetimes. This issue is fixed in iOS 12.5.2, iOS 14.4.2 and iPadOS 14.4.2, watchOS 7.3.3. Processing maliciously crafted web content may lead to universal cross site scripting. Apple is aware of a report that this issue may have been actively exploited..

Why it matters now

Exploitation Active In CISA KEV since 2021-11-03CISA due date 2021-11-17

EPSS 0.07082 94th percentileScored 2026-11-07

Fix Fixed iOS and iPadOS (Apple): 14.4iOS (Apple): 12.5+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Active
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Apple	iOS and iPadOS	before 14.4	14.4	Patch available	CNA
Apple	iOS	before 12.5	12.5	Patch available	CNA
Apple	watchOS	before 7.3	7.3	Patch available	CNA

iOS and iPadOS VendorApple Affected before 14.4 Fixed in 14.4 Patch available CNA
iOS VendorApple Affected before 12.5 Fixed in 12.5 Patch available CNA
watchOS VendorApple Affected before 7.3 Fixed in 7.3 Patch available CNA

CPE configurations NVD · 3

CPE	Versions	Role	Vendor
cpe:2.3:o:apple:ipados::::::::	before 14.4.2	Vulnerable	Apple
cpe:2.3:o:apple:iphone_os::::::::	before 12.5.2; 13.0 to before 14.4.2	Vulnerable	Apple
cpe:2.3:o:apple:watchos::::::::	before 7.3.3	Vulnerable	Apple

cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* Versions before 14.4.2 Vulnerable ·Apple
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* Versions before 12.5.2; 13.0 to before 14.4.2 Vulnerable ·Apple
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* Versions before 7.3.3 Vulnerable ·Apple

Remediation

Fix · CNA iOS and iPadOS (Apple) Fixed in 14.4
Fix · CNA iOS (Apple) Fixed in 12.5
Fix · CNA watchOS (Apple) Fixed in 7.3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2021-04-02
Apple iOS and iPadOS 14.4
49 records Highest priority Priority CRITICAL 3 CRITICAL, 1 HIGH, 6 MEDIUM, 39 LOW
Other records, highest priority first
- TI-2021-01572 Apple iOS and iPadOS: A remote attacker may be able to cause arbitrary code executionPriority CRITICAL 100
- TI-2021-01502 Type confusion in Apple iOS and iPadOSPriority CRITICAL 97
- TI-2021-01495 Apple iOS and iPadOS: A malicious application may be able to elevate privilegesPriority CRITICAL 90
Show all 49 records →
Release · 2021-04-02
Apple iOS 12.5
2 records Highest priority Priority HIGH 1 HIGH, 1 LOW
Other records, highest priority first
- TI-2020-17005 Apple iOS and iPadOS: Unauthorized code execution may lead to an authentication policy…Priority LOW 36
Show all 2 records →

Show 1 more group

Release · 2021-04-02
Apple watchOS 7.3
2 records Highest priority Priority HIGH 1 HIGH, 1 MEDIUM
Other records, highest priority first
- TI-2021-01463 Improper input validation in Apple iOS and iPadOSPriority MEDIUM 43
Show all 2 records →

Timeline

2021-11-03 Added to CISA KEV
2026-10-02 Threatist record created from CVE-2021-1879
2026-10-03 Alias added: GHSA-qhqp-qw35-f96r

References

Advisory 3

TI-2025-28008 Out-of-bounds write in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 10.0
TI-2025-22441 Apple iOS and iPadOS: An attacker with arbitrary read and write capability may be able to… KEVCVSS 3.1CRITICAL 9.8
TI-2025-22440 Memory corruption in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 9.8
TI-2025-17951 Out-of-bounds write in Apple Safari KEVCVSS 3.1CRITICAL 10.0
TI-2025-17847 Use after free in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 10.0
TI-2022-06854 Out-of-bounds write in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 9.8

See all 2382 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences