CVE-2021-21870 Use after free in Foxit
A use-after-free in Foxit PDF Reader allows arbitrary code execution via a malicious PDF, requiring the browser plugin extension to be enabled.
- 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-2021-21870?
CVE-2021-21870 is a high-severity use after free vulnerability in Foxit Pdf Reader, published on 5 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 use-after-free vulnerability exists in the JavaScript engine of Foxit Software’s PDF Reader, version 10.1.4.37651. A specially crafted PDF document can trigger the reuse of previously free memory, which can lead to arbitrary code execution. An attacker needs to trick the user into opening a malicious file or site to trigger this vulnerability if the browser plugin extension is enabled.
Weakness: CWE-416
Which versions are affected by CVE-2021-21870?
It affects 1 product.
Products include Foxit Pdf Reader.
How do I fix CVE-2021-21870?
No fix has been published for CVE-2021-21870 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2021-21870 being exploited?
There is no known exploitation of CVE-2021-21870 in the wild and no public exploit code.
Other vulnerabilities in Foxit Pdf Reader
Sources
Also known as GHSA-4cm9-vfcj-fcm5.