Vulnerability · Published May 21, 2021 · Assigned by zdi

CVE-2021-31473

High 7.8

In plain English

A high-severity out-of-bounds write in Reader from Foxit. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 7.7% (higher than 95% of all known vulnerabilities).

Severity (CVSS 3.0)7.8High

Exploit odds (30 days)7.7%top 5.4% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit Reader 10.1.3.37598. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the browseForDoc function. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated data structure. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-13523.

Affected products (as reported)

Vendor	Product	Versions
Foxit	Reader	10.1.3.37598

Weakness: CWE-787 · Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

https://www.foxitsoftware.com/support/security-bulletins.php x_refsource_MISC
https://www.zerodayinitiative.com/advisories/ZDI-21-561/ x_refsource_MISC