CVE intelligence and bounded remediation

CVE-2021-23857 — Bosch Rexroth Indramotion Mlc L20 Firmware security vulnerability

Critical CVSS 10

Login with hash: The login routine allows the client to log in to the system not by using the password, but by using the hash of the password. Combined with CVE-2021-23858, this allows an attacker to subsequently login to the system.

Severity
Critical
CVSS
10 (3.1)
Published
2021-10-04
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-836, CWE-287

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_l75_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

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

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

The detailed catalog view below loads this exact record, its source evidence, and the full seven-phase agentic change plan.