CVE-2021-30870 Server-side request forgery in iOS and iPadOS
Attackers can force iOS devices to contact remote servers by tricking users into previewing malicious HTML attachments in Notes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-30870?
CVE-2021-30870 is a medium-severity server-side request forgery vulnerability in Apple Ipados, published on 24 Aug 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A logic issue existed in the handling of document loads. This issue was addressed with improved state management. This issue is fixed in iOS 15 and iPadOS 15. Previewing an html file attached to a note may unexpectedly contact remote servers.
Which versions are affected by CVE-2021-30870?
It affects 2 products.
Products include Apple Ipados, Apple Iphone Os.
How do I fix CVE-2021-30870?
No fix has been published for CVE-2021-30870 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2021-30870 being exploited?
There is no known exploitation of CVE-2021-30870 in the wild and no public exploit code.
Other vulnerabilities in Apple Ipados
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- 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