Release record

iOS 17.2.1

Full article

Public release

Recorded milestones: 1
Beta cycle: —
Average interval: —
Public release: Dec 19, 2023

Release notes

Overview

Editorial synthesis with inline references and a source ledger when citations are available.

Release overview

iOS 17.2.1 was publicly released on December 19, 2023. iOS 17.2.1 was a maintenance release that Apple described only as containing important bug fixes.^[1]^[2]

Apple did not identify the corrected bugs in its consumer note, and its 2023 security index records no published CVE entries. More specific claims would exceed the available first-party evidence.^[1]^[2]

Source ledger

References

Sources are linked to the claims they support. Publication and access dates are shown when available.

Apple security updates (2022 to 2023)
Apple Support · Apple · 2026-06-04T00:00:00.000Z · iOS 17.2.1 — no published CVE entries; 19 Dec 2023
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About iOS 17 Updates
Apple Support · Apple · 2025-05-13T00:00:00.000Z · iOS 17.2.1
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Documented & observed

Changes in this version

Source-linked features, fixes, known issues, removals, and community-observed behavior recorded across this version’s appearances and verified builds.

Release changes

Changed in this release

Features, fixes, removals, and regressions first observed in this release record.

bugFix · fixed

Unspecified maintenance fixes

documentedconfirmed

The public release carried maintenance fixes, but Apple did not publish enough detail to split them into narrower change records.

Recorded at Public

[1] Apple security updates (2022 to 2023) · iOS 17.2.1 — no published CVE entries; 19 Dec 2023
[2] About iOS 17 Updates · iOS 17.2.1

Milestones

Release history

Every recorded channel appearance in chronological order. Open an appearance for any available build, scope, notes, and sources.

Dec 19, 2023
Public release
Public
Full articleEditorially verified
iOS 17.2.1 reached the public release channel on December 19, 2023. The public event is documented as a general reliability update; the underlying bug list remains unspecified.
Availability
available
Sources
2 linked
Open this appearance

Historical context

Cycle comparison

Pace, intervals, and duration compared with earlier releases on the same platform.

Historical avg for .2.1 releases

68 days, 6.0 milestones

Based on 1 previous iOS .2.1 releases

Previous .2.1 releases (iOS)

Previous comparable iOS releases
Version	Year	Cycle	Milestones	Avg. Interval
iOS 4.2.1	2010	68d	6	14d

Scroll horizontally to compare every historical field.

Official release notes