What is the CVSS score of CVE-2021-23857?

CVE-2021-23857 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 1.2%.

Rexroth Indramotion Xlc Firmware CVE-2021-23857

CRITICAL

Use of Password Hash Instead of Password for Authentication (CWE-836)

2021-10-04 psirt@bosch.com

Information Disclosure Rexroth Indramotion Xlc Firmware Rexroth Indramotion Mlc L20 Firmware Rexroth Indramotion Mlc L40 Firmware Rexroth Indramotion Mlc L25 Firmware Rexroth Indramotion Mlc L45 Firmware Rexroth Indramotion Mlc L65 Firmware Rexroth Indramotion Mlc L75 Firmware Rexroth Indramotion Mlc L85 Firmware Rexroth Indramotion Mlc Xm22 Firmware Rexroth Indramotion Mlc Xm21 Firmware Rexroth Indramotion Mlc Xm41 Firmware Rexroth Indramotion Mlc Xm42 Firmware Bosch

9.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-836 ASVS 5.0 V15 - Secure Coding and Architecture Use of password hash instead of password
Impact	CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

No patch listed yet 1.2% exploitation probability (EPSS)

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AnalysisAI

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. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-836. 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. Affected products include: 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.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionNVD

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.

Threat Intelligence Overview

EPSS Score

1.2%

Top 36% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC No

EPSS 1.2%

Patch available No

Active threat No

Deciding rule

CRITICAL severity

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +49

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.