CVE-2023-21584

Memory disclosure via freed embedded-font object

Published Feb 17, 2023 · Updated Aug 2, 2024

Use-after-free in embedded-font parsing in Adobe FrameMaker 2020 Update 4 and earlier and 2022 allows attackers to disclose memory via crafted files. The parser operates on an embedded-font object without confirming that the object still exists, exposing process memory after the object is freed. A victim must open the crafted file or visit a malicious page; the disclosure can reveal ASLR data and support a separate code-execution flaw.

CVSS severity5.5
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in embedded-font parsing in Adobe FrameMaker 2020 Update 4 and earlier and 2022 allows attackers to disclose memory via crafted files. The parser operates on an embedded-font object without confirming that the object still exists, exposing process memory after the object is freed. A victim must open the crafted file or visit a malicious page; the disclosure can reveal ASLR data and support a separate code-execution flaw.

The record

CVE
CVE-2023-21584
Published
Feb 17, 2023
Updated
Aug 2, 2024
Vendor
Adobe
Product
Adobe FrameMaker
Classifications
CWE-416, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=unspecified <=2020u4
  2. Affected versionversion=unspecified <=2022
  3. Affected versionversion=unspecified <=None

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Adobe · Adobe FrameMakerversion=unspecified <=2020u4; version=unspecified <=2022; version=unspecified <=None

Published CVSS scores

5.5AdobeCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
3.3Trend Micro Zero Day InitiativeCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/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-416Use After Free
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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