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CVE-2021-34840

25
FAUCET Score

CVE-2021-34840 is a critical vulnerability affecting Foxit PDF Reader 11.0.0.49893, allowing remote attackers to execute arbitrary code due to improper validation of Annotation objects. This high-severity flaw (CVSS 7.8) requires user interaction, as the target must open a malicious file or visit a malicious page, but can lead to full compromise of the affected process. While no public exploit code or active exploitation has been observed, and community discussion is minimal, the potential for high impact warrants attention.

Impacted Technologies

VendorProductVersion(s)CPE
<= 11.0.0.49893CPE matchmatch criteria
cpe:2.3:a:foxit:pdf_reader:*:*:*:*:*:*:*:*
<= 10.1.4.37651CPE matchmatch criteria
cpe:2.3:a:foxitsoftware:pdf_editor:*:*:*:*:*:*:*:*
11.0.0.49893CPE matchmatch criteria
cpe:2.3:a:foxitsoftware:pdf_editor:11.0.0.49893:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.8HIGH

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.00%
Probability of exploitation in next 30 days
EPSS Percentile
89.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0400 is in the 90th percentile among its peer group of 11,621 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

foxit.com / support/security-bulletins.html
Vendor Advisory
zerodayinitiative.com / advisories/ZDI-21-922
Third Party AdvisoryVDB Entry