CVE-2021-23857 | Login with hash

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.

Published: 2021-10-04 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-23857 is rated Moderate Risk (60.7/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.45%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-23857

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-30 0.93% 0.45% -0.48%
2 2025-03-29 0.45% 0.93% +0.48%
3 2025-03-17 — 0.45% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-23857

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 6.0 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2021-23857

Affected software / configurations for CVE-2021-23857

Vendor Product Version Raw CPE
bosch rexroth_indramotion_mlc_l20_firmware <= 12 cpe:2.3:o:bosch:rexroth_indramotion_mlc_l20_firmware:*:*:*:*:*:*:*:*
bosch rexroth_indramotion_mlc_l40_firmware <= 12 cpe:2.3:o:bosch:rexroth_indramotion_mlc_l40_firmware:*:*:*:*:*:*:*:*
bosch rexroth_indramotion_mlc_l25_firmware <= 12 cpe:2.3:o:bosch:rexroth_indramotion_mlc_l25_firmware:*:*:*:*:*:*:*:*
bosch rexroth_indramotion_mlc_l45_firmware <= 12 cpe:2.3:o:bosch:rexroth_indramotion_mlc_l45_firmware:*:*:*:*:*:*:*:*
bosch rexroth_indramotion_mlc_l65_firmware <= 12 cpe:2.3:o:bosch:rexroth_indramotion_mlc_l65_firmware:*:*:*:*:*:*:*:*
bosch rexroth_indramotion_mlc_l75_firmware <= 12 cpe:2.3:o:bosch:rexroth_indramotion_mlc_l75_firmware:*:*:*:*:*:*:*:*
bosch rexroth_indramotion_mlc_l85_firmware <= 12 cpe:2.3:o:bosch:rexroth_indramotion_mlc_l85_firmware:*:*:*:*:*:*:*:*
bosch rexroth_indramotion_mlc_xm22_firmware <= 12 cpe:2.3:o:bosch:rexroth_indramotion_mlc_xm22_firmware:*:*:*:*:*:*:*:*
bosch rexroth_indramotion_mlc_xm21_firmware <= 12 cpe:2.3:o:bosch:rexroth_indramotion_mlc_xm21_firmware:*:*:*:*:*:*:*:*
bosch rexroth_indramotion_mlc_xm41_firmware <= 12 cpe:2.3:o:bosch:rexroth_indramotion_mlc_xm41_firmware:*:*:*:*:*:*:*:*
bosch rexroth_indramotion_mlc_xm42_firmware <= 12 cpe:2.3:o:bosch:rexroth_indramotion_mlc_xm42_firmware:*:*:*:*:*:*:*:*
bosch rexroth_indramotion_xlc_firmware <= 12 cpe:2.3:o:bosch:rexroth_indramotion_xlc_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-23857

cvelogic Threat Intelligence