CVE-2021-27195Public exploitNetwork attack vector

Unauthenticated command execution via replayed teacher traffic

Published Mar 25, 2021 · Updated Aug 3, 2024

Improper authorization in the student client in Netop Vision Pro 9.7.1 and earlier allows remote attackers to execute commands via replayed traffic. The client accepts reused session identifiers and static teacher and student tokens, letting a forged teacher handshake replay run-command packets. Network access to the student client is required, and replayed commands run with the privileges of the logged-in student.

CVSS severity5.9
Medium
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in the student client in Netop Vision Pro 9.7.1 and earlier allows remote attackers to execute commands via replayed traffic. The client accepts reused session identifiers and static teacher and student tokens, letting a forged teacher handshake replay run-command packets. Network access to the student client is required, and replayed commands run with the privileges of the logged-in student.

The record

CVE
CVE-2021-27195
Published
Mar 25, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-863, T1059.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A: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 exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1059.001PowerShell

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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