How severe is CVE-2021-23857?

CVE-2021-23857 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-23857 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23857?

CVE-2021-23857 primarily affects Bosch Rexroth Indramotion Mlc L20 Firmware. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-23857?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-23857 published?

CVE-2021-23857 was published on 2021-10-04 and last updated on 2026-06-17.

CVE-2021-23857

CVE-2021-23857 is a critical-severity vulnerability in Bosch Rexroth Indramotion Mlc L20 Firmware with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
CVSS v2: 10.0
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Bosch Rexroth Indramotion Mlc L20 Firmware
Published: 2021-10-04
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-23857?: 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.
How severe is CVE-2021-23857?: CVE-2021-23857 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-23857 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23857?: CVE-2021-23857 primarily affects Bosch Rexroth Indramotion Mlc L20 Firmware. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-23857?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-23857 published?: CVE-2021-23857 was published on 2021-10-04 and last updated on 2026-06-17.

References

https://psirt.bosch.com/security-advisories/bosch-sa-741752.html

Affected products (12)

cpe:2.3:o:bosch:rexroth_indramotion_mlc_l20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:bosch:rexroth_indramotion_mlc_l40_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:bosch:rexroth_indramotion_mlc_l25_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:bosch:rexroth_indramotion_mlc_l45_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:bosch:rexroth_indramotion_mlc_l65_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:bosch:rexroth_indramotion_mlc_l75_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:bosch:rexroth_indramotion_mlc_l85_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:bosch:rexroth_indramotion_mlc_xm22_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:bosch:rexroth_indramotion_mlc_xm21_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:bosch:rexroth_indramotion_mlc_xm41_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:bosch:rexroth_indramotion_mlc_xm42_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:bosch:rexroth_indramotion_xlc_firmware:*:*:*:*:*:*:*:*

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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
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