Vulnerability · Published Aug 5, 2021 · Assigned by talos

CVE-2021-21831

High 8.8

In plain English

A high-severity use-after-free in Foxit. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 6.1% (higher than 93% of all known vulnerabilities).

Severity (CVSS 3.0)8.8High

Exploit odds (30 days)6.1%top 6.5% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
n/a	Foxit	Foxit Reader 10.1.3.37598

Weakness: CWE-416 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1294 x_refsource_MISC