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CVE-2021-34839

25
FAUCET Score

CVE-2021-34839 is a remote code execution vulnerability affecting Foxit PDF Reader version 11.0.0.49893, stemming from improper validation of Annotation objects. Exploitation requires user interaction, typically by opening a malicious file or visiting a malicious web page. This vulnerability carries a CVSS score of 7.8 (High), indicating a significant risk of arbitrary code execution in the context of the current process, with high impact on confidentiality, integrity, and availability. Despite its high severity, there is currently no public exploit code available (Metasploit, Nuclei, ExploitDB), nor is it listed on the CISA KEV catalog, suggesting it is not actively exploited in the wild. Community discussion and media coverage are also minimal.

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 2026-07-27
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-21-921
Third Party AdvisoryVDB Entry