CVE-2021-36134Public exploit

Endpoint crash via mismatched JPEG component count

Published Sep 27, 2021 · Updated Aug 4, 2024

Out-of-bounds write in Netop Vision Pro 9.7.2 and earlier allows attackers to crash an endpoint via a malformed JPEG image. MeImgLoadJpeg in MeImg.dll allocates the copy destination for three JPEG color components but uses the header-supplied component count to calculate copy addresses. Exploitation requires adjacent-network access and a four-component image; the network path can reach student clients through the blank-screen feature, while loading it on a teacher client also crashes that client.

CVSS severity7.4
High
EPSS probability0.54%
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 write in Netop Vision Pro 9.7.2 and earlier allows attackers to crash an endpoint via a malformed JPEG image. MeImgLoadJpeg in MeImg.dll allocates the copy destination for three JPEG color components but uses the header-supplied component count to calculate copy addresses. Exploitation requires adjacent-network access and a four-component image; the network path can reach student clients through the blank-screen feature, while loading it on a teacher client also crashes that client.

The record

CVE
CVE-2021-36134
Published
Sep 27, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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 vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.4MITRECVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
3.3NIST NVDAV:A/AC:L/Au:N/C:N/I:N/A:P

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

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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