CVE-2026-12488Network attack vector

Service interruption via unchecked relay message size

Published Jun 24, 2026 · Updated Jun 24, 2026

Stack-based buffer overflow in GeoVision GV-VMS 20.0.2 allows attackers to interrupt service through a malicious GV-Cloud relay response. GvRelayProxy.dll trusts the server-supplied message size and passes the unchecked remainder to recv_data for a 4,072-byte stack buffer. Exploitation requires impersonating relay.vsm.mygvcloud.com through a man-in-the-middle position or DNS tampering; an oversized response corrupts the stack, and a matching frame-size overwrite triggers a stack-cookie failure when the function returns.

CVSS severity6.2
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

Stack-based buffer overflow in GeoVision GV-VMS 20.0.2 allows attackers to interrupt service through a malicious GV-Cloud relay response. GvRelayProxy.dll trusts the server-supplied message size and passes the unchecked remainder to recv_data for a 4,072-byte stack buffer. Exploitation requires impersonating relay.vsm.mygvcloud.com through a man-in-the-middle position or DNS tampering; an oversized response corrupts the stack, and a matching frame-size overwrite triggers a stack-cookie failure when the function returns.

The record

CVE
CVE-2026-12488
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
GeoVision
Product
GV-VMS
Classifications
CWE-121, CAPEC-100, T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record 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=V20.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

GeoVision · GV-VMSversion=V20.0.2

Published CVSS scores

6.2GeoVisionCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:N/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CAPEC-100Overflow Buffers
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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