CVE-2023-28500Public exploitNetwork attack vector

Unauthenticated code execution via unsafe Java deserialization

Published Apr 6, 2023 · Updated May 5, 2025

Insecure deserialization in Adobe LiveCycle ES4 11.0 and earlier allows remote attackers to execute operating system code via crafted objects. The forms-processing endpoint passes attacker-supplied Java serialized objects to unsafe deserialization routines while running on Java 7u21 or earlier. No authentication is required, and code runs as the LiveCycle service account, so a privileged service account yields privileged operating-system access.

CVSS severity9.8
Critical
EPSS probability1.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure deserialization in Adobe LiveCycle ES4 11.0 and earlier allows remote attackers to execute operating system code via crafted objects. The forms-processing endpoint passes attacker-supplied Java serialized objects to unsafe deserialization routines while running on Java 7u21 or earlier. No authentication is required, and code runs as the LiveCycle service account, so a privileged service account yields privileged operating-system access.

The record

CVE
CVE-2023-28500
Published
Apr 6, 2023
Updated
May 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2023CVE publishedPublication date reported by the CVE source.
  2. May 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

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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