CVE-2020-4128

HCL Domino is susceptible to a lockout policy bypass vulnerability in the ID Vault service. An unauthenticated attacker could use this vulnerability to mount a brute force attack against the ID Vault service.

Published: 2020-12-01 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-4128 is rated Moderate Risk (41.4/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.93%). 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-2020-4128

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 2026-06-15 0.32% 0.93% +0.61%
2 2025-03-30 0.49% 0.32% -0.17%
3 2025-03-29 — 0.49% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-4128

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N 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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N 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:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2020-4128

Affected software / configurations for CVE-2020-4128

Vendor Product Version Raw CPE
hcltech domino >= 9.0.0, <= 9.0.1 cpe:2.3:a:hcltech:domino:*:*:*:*:*:*:*:*
hcltech domino >= 10.0.0, <= 10.0.1 cpe:2.3:a:hcltech:domino:*:*:*:*:*:*:*:*
hcltech domino >= 11.0.0, <= 11.0.1 cpe:2.3:a:hcltech:domino:*:*:*:*:*:*:*:*
hcltech domino 10.0.1 cpe:2.3:a:hcltech:domino:10.0.1:-:*:*:*:*:*:*
hcltech domino 10.0.1 cpe:2.3:a:hcltech:domino:10.0.1:fix_pack_1:*:*:*:*:*:*
hcltech domino 10.0.1 cpe:2.3:a:hcltech:domino:10.0.1:fix_pack_2:*:*:*:*:*:*
hcltech domino 10.0.1 cpe:2.3:a:hcltech:domino:10.0.1:fix_pack_3:*:*:*:*:*:*
hcltech domino 10.0.1 cpe:2.3:a:hcltech:domino:10.0.1:fix_pack_4:*:*:*:*:*:*

References for CVE-2020-4128

cvelogic Threat Intelligence