CVE-2021-23856Network attack vector

Client-side script execution via manipulated URL

Published Oct 4, 2021 · Updated Sep 17, 2024

Reflected XSS in Bosch Rexroth IndraMotion MLC L20 and L40 allows remote attackers to execute scripts via a manipulated URL. Bosch has not disclosed the affected endpoint or parameter, or how the web server fails to neutralize the supplied URL data. A client must load the attacker-supplied URL for script execution in that client’s browser context.

CVSS severity10.0
Critical
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Bosch Rexroth IndraMotion MLC L20 and L40 allows remote attackers to execute scripts via a manipulated URL. Bosch has not disclosed the affected endpoint or parameter, or how the web server fails to neutralize the supplied URL data. A client must load the attacker-supplied URL for script execution in that client’s browser context.

The record

CVE
CVE-2021-23856
Published
Oct 4, 2021
Updated
Sep 17, 2024
Vendor
Bosch Rexroth AG
Product
IndraMotion MLC L20, L40
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Bosch Rexroth AG · IndraMotion MLC L20, L40version=All

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
10.0Robert Bosch GmbHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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