CVE-2023-38239

Memory disclosure via embedded-font bounds check failure

Published Aug 10, 2023 · Updated Feb 27, 2025

Out-of-bounds read in Adobe Acrobat Reader 23.003.20244 and earlier allows remote attackers to disclose memory through an embedded font. The embedded-font parser fails to validate user-supplied data before reading beyond the end of an allocated object. Exploitation requires a victim to open a malicious file; Acrobat Reader 2020 20.005.30467 and earlier is also affected.

CVSS severity5.5
Medium
EPSS probability2.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in Adobe Acrobat Reader 23.003.20244 and earlier allows remote attackers to disclose memory through an embedded font. The embedded-font parser fails to validate user-supplied data before reading beyond the end of an allocated object. Exploitation requires a victim to open a malicious file; Acrobat Reader 2020 20.005.30467 and earlier is also affected.

The record

CVE
CVE-2023-38239
Published
Aug 10, 2023
Updated
Feb 27, 2025
Vendor
Adobe
Product
Adobe Acrobat Reader
Classifications
CWE-125, CAPEC-540, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=23.003.20244

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Adobe · Adobe Acrobat Readerversion=0 <=23.003.20244

Published CVSS scores

5.5Adobe Systems IncorporatedCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CAPEC-540Overread Buffers
T1204.002Malicious File

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo