CVE-2023-28504Public exploitNetwork attack vector

Pre-authentication root code execution via unbounded credential copies

Published Mar 29, 2023 · Updated Feb 18, 2025

Stack buffer overflow in UniData before 8.2.4.3003 and UniVerse before 11.3.5.1001 or 12.2.1.2002 allows remote attackers root code execution. U_rep_rpc_server_submain uses u2strcpy without bounds checks to copy RPC username and password fields into stack buffers. The default Linux UniRPC service exposes the function through rmconn82 and unirep82 before authentication, enabling return-address overwrite in a root process.

CVSS severity9.8
Critical
EPSS probability1.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in UniData before 8.2.4.3003 and UniVerse before 11.3.5.1001 or 12.2.1.2002 allows remote attackers root code execution. U_rep_rpc_server_submain uses u2strcpy without bounds checks to copy RPC username and password fields into stack buffers. The default Linux UniRPC service exposes the function through rmconn82 and unirep82 before authentication, enabling return-address overwrite in a root process.

The record

CVE
CVE-2023-28504
Published
Mar 29, 2023
Updated
Feb 18, 2025
Vendor
Rocket Software
Product
UniData
Classifications
CWE-120, CWE-787, T1210
Attack vector
network
Privileges
unauthenticated

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 privilegesunauthenticated

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

9.8NISTCVSS: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.

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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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-787Out-of-bounds Write
T1210Exploitation of Remote Services

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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