CVE-2018-20310Public exploit

Local privilege escalation via unchecked proxyDoAction opcodes

Published Jan 7, 2021 · Updated Aug 5, 2024

Privilege escalation in Foxit Reader before 9.5 and PhantomPDF before 8.3.10 or 9.x before 9.5 allows local users to execute code. The proxyDoAction request handler fails to validate user-supplied opcode data, allowing a race condition to trigger a stack-based buffer overflow or out-of-bounds read. Successful exploitation requires existing low-privileged code execution on Windows and runs code at medium integrity.

CVSS severity8.1
High
EPSS probability0.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Foxit Reader before 9.5 and PhantomPDF before 8.3.10 or 9.x before 9.5 allows local users to execute code. The proxyDoAction request handler fails to validate user-supplied opcode data, allowing a race condition to trigger a stack-based buffer overflow or out-of-bounds read. Successful exploitation requires existing low-privileged code execution on Windows and runs code at medium integrity.

The record

CVE
CVE-2018-20310
Published
Jan 7, 2021
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, CWE-787, CWE-125, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-787Out-of-bounds Write
CWE-125Out-of-bounds Read
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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