CVE-2023-28508Public exploitNetwork attack vector

Service crash via malformed subscription request

Published Mar 29, 2023 · Updated Feb 18, 2025

Heap overflow in Rocket Software UniData and UniVerse allows remote authenticated users to crash the forked udsub process. Processing a complex unirep82 subscription request reaches U_unpack_conn_package, corrupts heap state, and frees an invalid pointer; the precise root cause is undisclosed. A valid login is normally required, but CVE-2023-28503 removes that gate on installations where both flaws remain unpatched; only a child-process crash is demonstrated, not code execution.

CVSS severity8.8
High
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in Rocket Software UniData and UniVerse allows remote authenticated users to crash the forked udsub process. Processing a complex unirep82 subscription request reaches U_unpack_conn_package, corrupts heap state, and frees an invalid pointer; the precise root cause is undisclosed. A valid login is normally required, but CVE-2023-28503 removes that gate on installations where both flaws remain unpatched; only a child-process crash is demonstrated, not code execution.

The record

CVE
CVE-2023-28508
Published
Mar 29, 2023
Updated
Feb 18, 2025
Vendor
Rocket Software
Product
UniData
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 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 <8.2.43.3003

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Rocket Software · UniDataversion=0 <8.2.43.3003
Rocket Software · UniVerseversion=0 <11.3.5.1001; version=0 <12.2.1.2002

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

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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