CVE-2023-21598

Memory disclosure via stale embedded-font object

Published Jan 13, 2023 · Updated Mar 5, 2025

Use-after-free in embedded-font parsing in Adobe InCopy 18.0 and earlier and 17.4 and earlier allows remote attackers to disclose memory. The parser performs operations on an embedded-font object without first validating that the object still exists after it has been freed. Exploitation requires the target to visit a malicious page or open a malicious file; the disclosure can help bypass ASLR and support a code-execution chain.

CVSS severity5.5
Medium
EPSS probability0.34%
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 InCopy 18.0 and earlier and 17.4 and earlier allows remote attackers to disclose memory. The parser performs operations on an embedded-font object without first validating that the object still exists after it has been freed. Exploitation requires the target to visit a malicious page or open a malicious file; the disclosure can help bypass ASLR and support a code-execution chain.

The record

CVE
CVE-2023-21598
Published
Jan 13, 2023
Updated
Mar 5, 2025
Vendor
Adobe
Product
InCopy
Classifications
CWE-416, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 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=unspecified <=17.4
  2. Affected versionversion=unspecified <=18.0
  3. Affected versionversion=unspecified <=None

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Adobe · InCopyversion=unspecified <=17.4; version=unspecified <=18.0; 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
T1204.002User Execution Malicious 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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