Public proof of conceptFix available

CVE-2021-1748

Q: Is CVE-2021-1748 actively exploited?

Active exploitation of CVE-2021-1748 has not been confirmed. Its EPSS score was 2.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-1748?

CVE-2021-1748 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.

A public proof of concept exists; no exploitation attested.

Published2021-04-02
Fixed in14.4
WeaknessCWE-20

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 validation issue was addressed with improved input sanitization. This issue is fixed in tvOS 14.4, watchOS 7.3, iOS 14.4 and iPadOS 14.4. Processing a maliciously crafted URL may lead to arbitrary javascript code execution.

Timeline

dates in UTC

2021-04-0218:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 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-2021-1748?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-1748?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Apple ipados

Branch	Affected	Fixed in	Source
14.4	< 14.4	14.4	NVD

Apple iphone os

Branch	Affected	Fixed in	Source
14.4	< 14.4	14.4	NVD

Apple tvos

Branch	Affected	Fixed in	Source
14.4	< 14.4	14.4	NVD

1 more product in the sources.

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

Fix

Update Apple ipados to 14.4

Advisories and patches

support.apple.comRelease Notes · Vendor Advisory
support.apple.comRelease Notes · Vendor Advisory
support.apple.comRelease Notes · Vendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedIvanhoe76zzzz/itmsBlock

Sources

NVDCVSS 3.18.8read 2026-10-23
NVDCVSS 2.06.8read 2026-10-23
NVDweakness (CWE)CWE-20read 2026-10-23
FIRST EPSSEPSS score2.7 %2026-10-22
PoC-in-GitHubproof of concept1read 2026-10-23

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: 2021-04-02
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-1748?

Is CVE-2021-1748 actively exploited?

Active exploitation of CVE-2021-1748 has not been confirmed. Its EPSS score was 2.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-1748?

CVE-2021-1748 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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