Skip to main content

Pdf Editor CVE-2021-38567

HIGH
NULL Pointer Dereference (CWE-476)
2021-08-11 cve@mitre.org
Denial Of Service Null Pointer Dereference Apple Pdf Reader Pdf Editor Foxit Foxitsoftware
7.5
CVSS 3.1 · NVD
View

Vulnerability Assessment

Weakness
CWE
CWE-476
OWASP Top 10:2025
A10:2025 - Mishandling of Exceptional Conditions
ASVS 5.0
V16 - Security Logging and Error Handling Null pointer safety, defensive checks
MITRE ATT&CK

1 technique across 1 tactic: Impact

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Sign in to read
Impact

CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived

A remote attacker could crash the application by dereferencing a null pointer by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 1.0% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAI

An issue was discovered in Foxit PDF Editor before 11.0.1 and PDF Reader before 11.0.1 on macOS. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Check pointers before dereferencing. Use static analysis tools to detect null pointer paths.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Sign in to check
Technical ContextAI · show details

This vulnerability is classified as NULL Pointer Dereference (CWE-476), which allows attackers to crash the application by dereferencing a null pointer. An issue was discovered in Foxit PDF Editor before 11.0.1 and PDF Reader before 11.0.1 on macOS. It mishandles missing dictionary entries, leading to a NULL pointer dereference, aka CNVD-C-2021-95204. Affected products include: Foxit Pdf Reader, Foxitsoftware Pdf Editor. Version information: before 11.0.1.

Know when Pdf Editor gets its next vulnerability

  • Watch products and get an email when something new is published
  • Check this CVE against your own stack and servers
  • Exploit and PoC references, threat intelligence from 22 sources
Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

DescriptionNVD

An issue was discovered in Foxit PDF Editor before 11.0.1 and PDF Reader before 11.0.1 on macOS. It mishandles missing dictionary entries, leading to a NULL pointer dereference, aka CNVD-C-2021-95204.

Threat Intelligence Overview

EPSS Score
1.0%
Top 42% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 1.0%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +38
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Null Pointer Dereference MEDIUM

A null pointer dereference occurs when a program attempts to access memory through a pointer that has been set to NULL (address 0x0).

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)NVD

cpe:2.3:a:foxit:pdf_reader:*:*:*:*:*:*:*:*
cpe:2.3:a:foxitsoftware:pdf_editor:*:*:*:*:*:*:*:*

More in Pdf Editor

View all
CVE-2022-28104 CRITICAL POC
9.8 May 20

Foxit PDF Editor v11.3.1 was discovered to contain an arbitrary file upload vulnerability. Rated critical severity (CVSS
CVE-2024-49576 HIGH POC
8.8 Dec 18

A use-after-free vulnerability exists in the way Foxit Reader 2024.3.0.26795 handles a checkbox CBF_Widget object. Rated
CVE-2024-47810 HIGH POC
8.8 Dec 18

A use-after-free vulnerability exists in the way Foxit Reader 2024.3.0.26795 handles a 3D page object. Rated high severi
CVE-2024-25938 HIGH POC
8.8 Apr 30

A use-after-free vulnerability exists in the way Foxit Reader 2024.1.0.23997 handles a Barcode widget. Rated high severi
CVE-2024-25648 HIGH POC
8.8 Apr 30

A use-after-free vulnerability exists in the way Foxit Reader 2024.1.0.23997 handles a ComboBox widget. Rated high sever
CVE-2024-25575 HIGH POC
8.8 Apr 30

A type confusion vulnerability vulnerability exists in the way Foxit Reader 2024.1.0.23997 handles a Lock object. Rated

CVE-2024-29072 HIGH POC
8.2 May 28

A privilege escalation vulnerability exists in the Foxit Reader 2024.2.0.25138. Rated high severity (CVSS 8.2), this vul
CVE-2022-26979 HIGH POC
7.5 Aug 06

Foxit PDF Reader before 12.0.1 and PDF Editor before 12.0.1 allow a NULL pointer dereference when this.Span is used for

CVE-2022-27944 HIGH POC
7.5 Aug 06

Foxit PDF Reader before 12.0.1 and PDF Editor before 12.0.1 allow an exportXFAData NULL pointer dereference. Rated high

CVE-2021-38563 CRITICAL
9.8 Aug 11

An issue was discovered in Foxit PDF Reader before 11.0.1 and PDF Editor before 11.0.1. Rated critical severity (CVSS 9.
CVE-2022-27359 MEDIUM POC
5.5 May 05

Foxit PDF Reader before 12.0.1 and PDF Editor before 12.0.1 allow a this.maildoc NULL pointer dereference. Rated medium

CVE-2021-38564 CRITICAL
9.1 Aug 11

An issue was discovered in Foxit PDF Reader before 11.0.1 and PDF Editor before 11.0.1. Rated critical severity (CVSS 9.

Same weakness CWE-476 – NULL Pointer Dereference

View all
CVE-2016-0742 HIGH
7.5
CVE-2014-3470 MEDIUM
4.3
CVE-2020-1967 HIGH POC
7.5
CVE-2017-3730 HIGH POC
7.5
CVE-2017-3169 CRITICAL POC
9.8
CVE-2016-4957 HIGH
7.5
CVE-2021-3449 MEDIUM
5.9
CVE-2015-3194 HIGH
7.5

Same technique Denial Of Service

View all
CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

References

Advisories & patches
ADVISORY https://www.foxitsoftware.com/support/security-bulletins.php

Search Externally

GitHub PoC Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy