CVE-2021-1855 Server-side request forgery in macOS
A malicious website can force unnecessary network connections to fetch its favicon, potentially exposing internal network details.
- 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-2021-1855?
CVE-2021-1855 is a medium-severity server-side request forgery vulnerability in Apple Macos, published on 8 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3. A malicious website may be able to force unnecessary network connections to fetch its favicon.
Which versions are affected by CVE-2021-1855?
It affects 1 product.
Products include Apple Macos.
How do I fix CVE-2021-1855?
No fix has been published for CVE-2021-1855 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-2021-1855 being exploited?
There is no known exploitation of CVE-2021-1855 in the wild and no public exploit code.
Other vulnerabilities in Apple Macos
Sources
Also known as GHSA-x2pr-2f5w-h2hj.