CVE-2021-26622Network attack vector

Unauthenticated code execution via filename template injection

Published Mar 25, 2022 · Updated Aug 3, 2024

Server-side template injection in Genians Genian NAC Suite 4.0.145.0831 and earlier allows remote attackers to execute code. A network-sensor API passes insufficiently validated filename input into server-side template processing, allowing injected expressions to reach command execution. No authentication or user interaction is required, and successful exploitation runs code with SYSTEM privileges across connected nodes.

CVSS severity9.6
Critical
EPSS probability3.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side template injection in Genians Genian NAC Suite 4.0.145.0831 and earlier allows remote attackers to execute code. A network-sensor API passes insufficiently validated filename input into server-side template processing, allowing injected expressions to reach command execution. No authentication or user interaction is required, and successful exploitation runs code with SYSTEM privileges across connected nodes.

The record

CVE
CVE-2021-26622
Published
Mar 25, 2022
Updated
Aug 3, 2024
Vendor
Genians
Product
Genian NAC Suite
Classifications
CWE-20, CWE-94, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 2022CVE 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?

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

  1. Affected versionversion=unspecified <=4.0.145.0831

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Genians · Genian NAC Suiteversion=unspecified <=4.0.145.0831

Published CVSS scores

9.6KrCERT/CCCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
10.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

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-20Improper Input Validation
CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

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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