CVE-2020-9823 Business logic in iOS
Removed users can alter iMessage conversation state due to insufficient checks, requiring an iOS upgrade to fix.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-9823?
CVE-2020-9823 is a high-severity vulnerability in Apple Ipados, published on 9 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
This issue was addressed with improved checks. This issue is fixed in iOS 13.5 and iPadOS 13.5. Users removed from an iMessage conversation may still be able to alter state.
Which versions are affected by CVE-2020-9823?
It affects 2 products.
Products include Apple Ipados, Apple Iphone Os.
How do I fix CVE-2020-9823?
No fix has been published for CVE-2020-9823 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-9823 being exploited?
There is no known exploitation of CVE-2020-9823 in the wild and no public exploit code.
Other vulnerabilities in Apple Ipados
- CVE-2025-43300 Apple iOS, iPadOS, and macOS Out-of-Bounds Write
- CVE-2025-24201 Apple Multiple Products WebKit Out-of-Bounds Write
- CVE-2025-24085 Apple Multiple Products Use-After-Free
- CVE-2025-31200 Apple Multiple Products Memory Corruption
- CVE-2025-31201 Apple Multiple Products Arbitrary Read and Write
Sources
Also known as GHSA-4ff7-c847-2h7q.