What is CVE-2021-21870?

CVE-2021-21870 is a high-severity vulnerability in Foxit Pdf Reader, classified under Use After Free. CVSS score: 8.8/10. Published 2021-08-05.

How severe is CVE-2021-21870?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2021-21870 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Use After Free in Foxit Pdf Reader

CVE-2021-21870

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.

Vulnerability class: Use-After-Free

EPSS: 0.019 (77.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Foxit Pdf_reader — versions 10.1.4.37651
N/a Foxit — versions Foxit Reader 10.1.4.37651

Weakness classification (CWE)

CWE-416 — Use After Free

Public proof-of-concept exploits

References

talos-cna@cisco.com (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-21870?: CVE-2021-21870 is a high-severity vulnerability in Foxit Pdf Reader, classified under Use After Free. CVSS score: 8.8/10. Published 2021-08-05.
How severe is CVE-2021-21870?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2021-21870 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.