Vulnerability · Published Feb 4, 2022 · Assigned by talos

CVE-2021-40420

High 8.8

In plain English

A high-severity use-after-free in Foxit. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 4.7% (higher than 92% of all known vulnerabilities).

Severity (CVSS 3.0)8.8High

Exploit odds (30 days)4.7%top 8.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A use-after-free vulnerability exists in the JavaScript engine of Foxit Software’s PDF Reader, version 11.1.0.52543. 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 11.1.0.52543

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-2021-1429 x_refsource_MISC