CVE-2018-20316

Code execution via proxyDoAction race condition

Published Jan 7, 2021 · Updated Aug 5, 2024

Race condition in Foxit Reader before 9.5 and PhantomPDF before 8.3.10 or 9.x before 9.5 allows attackers to execute code or read data. The proxyDoAction function processes a large integer or long string without safe synchronization, producing a stack buffer overflow or out-of-bounds read. Triggering the affected opcode requires crafted input and a successful race; resulting code executes in the application process, while an out-of-bounds read exposes process data.

CVSS severity8.1
High
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Foxit Reader before 9.5 and PhantomPDF before 8.3.10 or 9.x before 9.5 allows attackers to execute code or read data. The proxyDoAction function processes a large integer or long string without safe synchronization, producing a stack buffer overflow or out-of-bounds read. Triggering the affected opcode requires crafted input and a successful race; resulting code executes in the application process, while an out-of-bounds read exposes process data.

The record

CVE
CVE-2018-20316
Published
Jan 7, 2021
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, CWE-362, CWE-125, T1203
Attack vector
Unavailable
Privileges
Unavailable

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 vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

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

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization
CWE-125Out-of-bounds Read
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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