CVE-2023-44356

Sensitive-memory disclosure via embedded-font buffer over-read

Published Nov 16, 2023 · Updated Sep 11, 2024

Out-of-bounds read in Adobe Acrobat Reader 23.006.20360 and earlier and 20.005.30524 and earlier allows remote attackers to disclose memory. The embedded-font parser fails to validate user-supplied font data before reading past the end of its allocated buffer. Exploitation requires a victim to open a malicious file or visit a malicious page; the resulting memory disclosure can assist ASLR bypass.

CVSS severity5.5
Medium
EPSS probability2.04%
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 23.006.20360 and earlier and 20.005.30524 and earlier allows remote attackers to disclose memory. The embedded-font parser fails to validate user-supplied font data before reading past the end of its allocated buffer. Exploitation requires a victim to open a malicious file or visit a malicious page; the resulting memory disclosure can assist ASLR bypass.

The record

CVE
CVE-2023-44356
Published
Nov 16, 2023
Updated
Sep 11, 2024
Vendor
Adobe
Product
Adobe Acrobat Reader
Classifications
CWE-125, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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?

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

  1. Affected versionversion=0 <=23.006.20360

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Adobe · Adobe Acrobat Readerversion=0 <=23.006.20360

Published CVSS scores

3.3Zero Day InitiativeCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
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
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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