CVE-2021-22771

Arbitrary command execution via CSV formula injection

Published Jul 21, 2021 · Updated Aug 3, 2024

CSV formula injection in Schneider Electric Easergy T300 firmware 2.7.1 and earlier allows local users to execute arbitrary commands. The firmware writes attacker-controlled values to an exported CSV file without neutralizing spreadsheet formula prefixes. A low-privileged user must plant the crafted value, and another user must open the CSV in spreadsheet software for the formula to run commands in that user's environment.

CVSS severity7.3
High
EPSS probability1.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSV formula injection in Schneider Electric Easergy T300 firmware 2.7.1 and earlier allows local users to execute arbitrary commands. The firmware writes attacker-controlled values to an exported CSV file without neutralizing spreadsheet formula prefixes. A low-privileged user must plant the crafted value, and another user must open the CSV in spreadsheet software for the formula to run commands in that user's environment.

The record

CVE
CVE-2021-22771
Published
Jul 21, 2021
Updated
Aug 3, 2024
Vendor
Schneider Electric
Product
Easergy T300
Classifications
CWE-1236, T1204.002
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 21, 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?

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

  1. Affected versionversion=Easergy T300 with firmware V2.7.1 and older

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Schneider Electric · Easergy T300version=Easergy T300 with firmware V2.7.1 and older

Published CVSS scores

7.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
6.0NIST NVDAV:N/AC:M/Au:S/C:P/I:P/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1236Improper Neutralization of Formula Elements in a CSV File
T1204.002Malicious File

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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