CVE intelligence and bounded remediation

CVE-2021-23858 — Bosch Rexroth Indramotion Mlc L20 Firmware security vulnerability

High CVSS 8.6

Information disclosure: The main configuration, including users and their hashed passwords, is exposed by an unprotected web server resource and can be accessed without authentication. Additionally, device details are exposed which include the serial number and the firmware version by another unprotected web server resource.

Severity
High
CVSS
8.6 (3.1)
Published
2021-10-04
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-200, CWE-306

Affected products

  • bosch / rexroth_indramotion_mlc_l20_firmware
  • bosch / rexroth_indramotion_mlc_l40_firmware
  • bosch / rexroth_indramotion_mlc_l25_firmware
  • bosch / rexroth_indramotion_mlc_l45_firmware
  • bosch / rexroth_indramotion_mlc_l65_firmware
  • bosch / rexroth_indramotion_mlc_l85_firmware

Showing 6 representative product identities from 12 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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