CVE-2021-22682

Local privilege escalation via writable installation files

Published Apr 23, 2021 · Updated Aug 3, 2024

Improper access control in Horner Automation Cscape before 9.90 SP4 allows local users to escalate privileges by replacing installed files. The default all-users installation grants unprivileged accounts read and write access to Cscape binaries and configuration files. A local account is required; modifying those files can cause attacker-controlled code or configuration to run with higher privileges.

CVSS severity8.4
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Horner Automation Cscape before 9.90 SP4 allows local users to escalate privileges by replacing installed files. The default all-users installation grants unprivileged accounts read and write access to Cscape binaries and configuration files. A local account is required; modifying those files can cause attacker-controlled code or configuration to run with higher privileges.

The record

CVE
CVE-2021-22682
Published
Apr 23, 2021
Updated
Aug 3, 2024
Vendor
Horner Automation
Product
Cscape
Classifications
CWE-284, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 23, 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=All versions prior to 9.90 SP4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Horner Automation · Cscapeversion=All versions prior to 9.90 SP4

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.4CISA ICS-CERTCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/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.

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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-284Improper Access Control
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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