---
title: "Security digest: December 13, 2021"
url: https://erroneo.us/security/2021-12-13/
description: "December 13, 2021 vulnerability digest: 1 brief (Coruna). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2021-12-13
date_modified: 2026-10-23
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: December 13, 2021

1 editorial brief.

## Take stock

- Check exposure: Coruna . Anyone with iPhones or iPads below iOS 17.3 (on 17), 16.7.5 (on 16) or 15.8.7 (on 15), Macs below Sonoma 14.3, Ventura 13.6.4 or Monterey 12.7.3 without Safari 17.3, or WebKitGTK or WPE WebKit below 2.42.5.
- None of it touches your stack? Then there is nothing to do today. That is a result, not a failure to read carefully.

## Editorial briefs

- **Check exposure** [Apple WebKit Bugs Behind the Coruna iOS Exploit Kit](https://erroneo.us/security/briefs/apple-webkit-coruna-cve-2021-30952-2023-43000-2024-23222/index.md): All three are fixed on current builds, but Coruna moved from spyware customers to mass scam sites and iOS 15 devices got two of these fixes only in March 2026, so find any device still behind.

## Known exploited (CISA KEV)

None.

## Critical advisories

None.

---
Source page: https://erroneo.us/security/2021-12-13/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt