How severe is CVE-2021-40326?

CVE-2021-40326 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-40326 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40326?

CVE-2021-40326 primarily affects Foxit Pdf Editor. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-40326?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-40326 published?

CVE-2021-40326 was published on 2022-08-29 and last updated on 2026-06-17.

CVE-2021-40326

CVE-2021-40326 is a medium-severity vulnerability in Foxit Pdf Editor with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-347.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-347
Affected product: Foxit Pdf Editor
Published: 2022-08-29
Last modified: 2026-06-17

Description

Foxit PDF Reader before 11.1 and PDF Editor before 11.1, and PhantomPDF before 10.1.6, mishandle hidden and incremental data in signed documents. An attacker can write to an arbitrary file, and display controlled contents, during signature verification.

Frequently asked questions

What is CVE-2021-40326?: Foxit PDF Reader before 11.1 and PDF Editor before 11.1, and PhantomPDF before 10.1.6, mishandle hidden and incremental data in signed documents. An attacker can write to an arbitrary file, and display controlled contents, during signature verification.
How severe is CVE-2021-40326?: CVE-2021-40326 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-40326 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40326?: CVE-2021-40326 primarily affects Foxit Pdf Editor. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-40326?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-40326 published?: CVE-2021-40326 was published on 2022-08-29 and last updated on 2026-06-17.

References

https://www.foxit.com/support/security-bulletins.html

Affected products (3)

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

More vulnerabilities in Foxit Pdf Editor

CVE-2022-28104 — Critical (CVSS 9.8): Foxit PDF Editor v11.3.1 was discovered to contain an arbitrary file upload vulnerability.
CVE-2022-24955 — Critical (CVSS 9.8): Foxit PDF Reader before 11.2.1 and Foxit PDF Editor before 11.2.1 have an Uncontrolled Search Path Element for DLL…
CVE-2022-24954 — Critical (CVSS 9.8): Foxit PDF Reader before 11.2.1 and Foxit PDF Editor before 11.2.1 have a Stack-Based Buffer Overflow related to XFA,…
CVE-2025-13941 — High (CVSS 8.8): A local privilege escalation vulnerability exists in the Foxit PDF Reader/Editor Update Service. During plugin…
CVE-2024-49576 — High (CVSS 8.8): A use-after-free vulnerability exists in the way Foxit Reader 2024.3.0.26795 handles a checkbox CBF_Widget object. A…
CVE-2024-47810 — High (CVSS 8.8): A use-after-free vulnerability exists in the way Foxit Reader 2024.3.0.26795 handles a 3D page object. A specially…

All CVEs affecting Foxit Pdf Editor →

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