Use After Free in Foxit Pdf Reader

CVE-2021-21831

A use-after-free vulnerability exists in the JavaScript engine of Foxit Software’s PDF Reader, version 10.1.3.37598. A specially crafted PDF document can trigger the reuse of previously freed memory, which can lead to arbitrary code execution. An attacker needs to trick the user to open the malicious file to trigger this vulnerability. Exploitation is also possible if a user visits a specially crafted, malicious site if the browser plugin extension is enabled.

Vulnerability class: Use-After-Free

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.062 (93.2th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-21831: held from 0.062 to 0.062.

EPSS over last 30 days · oldest: 0.062 · newest: 0.062 · change: 0.000

Affected products

  • Foxit Pdf Reader — versions 10.1.3.37598
  • Foxit — versions Foxit Reader 10.1.3.37598

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-21831?
CVE-2021-21831 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-2021-21831?
High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2021-21831 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.