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CVE-2018-20310

24
FAUCET Score

CVE-2018-20310 describes a critical vulnerability affecting Foxit Reader before version 9.5 and PhantomPDF before versions 8.3.10 and 9.5. This flaw stems from a race condition in the proxyDoAction function, which can lead to a stack-based buffer overflow or an out-of-bounds read. With a CVSS score of 8.1 (HIGH), the vulnerability is remotely exploitable with high impact on confidentiality, integrity, and availability, though it requires high attack complexity. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 8.3.10CPE matchmatch criteria
cpe:2.3:a:foxitsoftware:phantompdf:*:*:*:*:*:*:*:*
>= 9.0, < 9.5CPE matchmatch criteria
cpe:2.3:a:foxitsoftware:phantompdf:*:*:*:*:*:*:*:*
< 9.5CPE matchmatch criteria
cpe:2.3:a:foxitsoftware:reader:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.86%
Probability of exploitation in next 30 days
EPSS Percentile
54.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0086 is in the 22nd percentile among its peer group of 8,920 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

foxitsoftware.com / support/security-bulletins.php
Vendor Advisory