CVE-2026-39929Network attack vector

Remote crash via malformed UDP command packet

Published May 28, 2026 · Updated May 28, 2026

Out-of-bounds read in affected Lakeside Software SysTrack Agent builds allows remote attackers to crash LsiAgent.exe with a UDP packet. The Command ID 30 handler dereferences a payload-supplied address at offset 0x4 without validating that the address is safe to read. No authentication or user interaction is required; one malformed datagram triggers an access violation and interrupts the endpoint agent.

CVSS severity8.7
High
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

Out-of-bounds read in affected Lakeside Software SysTrack Agent builds allows remote attackers to crash LsiAgent.exe with a UDP packet. The Command ID 30 handler dereferences a payload-supplied address at offset 0x4 without validating that the address is safe to read. No authentication or user interaction is required; one malformed datagram triggers an access violation and interrupts the endpoint agent.

The record

CVE
CVE-2026-39929
Published
May 28, 2026
Updated
May 28, 2026
Vendor
Lakeside Software
Product
SysTrack Agent
Classifications
CWE-754, CWE-125, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <11.2.1.28
  2. Affected versionversion=11.3.0.xxx <11.3.0.38
  3. Affected versionversion=11.4.0.xxx <11.4.0.24
  4. Affected versionversion=11.5.0.xxx <11.5.0.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Lakeside Software · SysTrack Agentversion=0 <11.2.1.28; version=11.3.0.xxx <11.3.0.38; version=11.4.0.xxx <11.4.0.24; version=11.5.0.xxx <11.5.0.15

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

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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