CVE-2023-38244

Memory disclosure via embedded-font parser over-read

Published Aug 10, 2023 · Updated Feb 27, 2025

Out-of-bounds read in Adobe Acrobat Reader 23.003.20244 and earlier allows attackers to disclose memory via a malicious PDF. The embedded-font parser fails to validate user-supplied font data before reading past an allocated object; Adobe Acrobat Reader 2020 20.005.30467 and earlier is also affected. A victim must open the file or visit a malicious page, and the disclosure can reveal addresses that weaken ASLR or support a separate code-execution chain.

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

What happened

Out-of-bounds read in Adobe Acrobat Reader 23.003.20244 and earlier allows attackers to disclose memory via a malicious PDF. The embedded-font parser fails to validate user-supplied font data before reading past an allocated object; Adobe Acrobat Reader 2020 20.005.30467 and earlier is also affected. A victim must open the file or visit a malicious page, and the disclosure can reveal addresses that weaken ASLR or support a separate code-execution chain.

The record

CVE
CVE-2023-38244
Published
Aug 10, 2023
Updated
Feb 27, 2025
Vendor
Adobe
Product
Adobe Acrobat Reader
Classifications
CWE-125, T1203, 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

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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

5.5AdobeCVSS: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.

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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
T1203Exploitation for Client Execution
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

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Your stack

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