CVE-2021-31442

Code execution via unchecked U3D object data

Published May 7, 2021 · Updated Aug 3, 2024

Out-of-bounds write in Foxit PDF Reader 10.1.1.37576 allows remote attackers to execute code via a crafted PDF containing U3D data. The 3D Plugin Beta fails to validate attacker-controlled U3D data ranges before writing into an allocated data structure, causing a write past its end. Exploitation requires a user to visit a malicious page or open the file, and successful code runs in the Reader process context.

CVSS severity7.8
High
EPSS probability2.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Foxit PDF Reader 10.1.1.37576 allows remote attackers to execute code via a crafted PDF containing U3D data. The 3D Plugin Beta fails to validate attacker-controlled U3D data ranges before writing into an allocated data structure, causing a write past its end. Exploitation requires a user to visit a malicious page or open the file, and successful code runs in the Reader process context.

The record

CVE
CVE-2021-31442
Published
May 7, 2021
Updated
Aug 3, 2024
Vendor
Foxit Software
Product
Foxit PDF Reader
Classifications
CWE-787, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.1.1.37576

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Foxit Software · Foxit PDF Readerversion=10.1.1.37576

Published CVSS scores

7.0NISTAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NISTCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8Zero Day InitiativeCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1204.002Malicious File
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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