CVE-2020-4097

In HCL Notes version 9 previous to release 9.0.1 FixPack 10 Interim Fix 8, version 10 previous to release 10.0.1 FixPack 6 and version 11 previous to 11.0.1 FixPack 1, a vulnerability in the input parameter handling of the Notes Client could potentially be exploited by an attacker resulting in a buffer overflow. This could enable an attacker to crash HCL Notes or execute attacker-controlled code on the client.

Published: 2020-11-05 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-4097 is rated Low Risk (35.4/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.31%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2020-4097

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 0.07% 0.31% +0.24%
2 2023-03-07 0.89% 0.07% -0.82%
3 2022-04-01 — 0.89% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-4097

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.8 3.1 MEDIUM
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:P)
Hands-on access—USB, keyboard, opening the case—not something you do purely over the wire.
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.
 0.9 5.9 [email protected]
4.6 2.0 MEDIUM
AV:L/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
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:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.9 6.4 [email protected]

Weakness enumeration for CVE-2020-4097

Affected software / configurations for CVE-2020-4097

Vendor Product Version Raw CPE
hcltech notes >= 9.0, <= 9.0.1 cpe:2.3:a:hcltech:notes:*:*:*:*:*:*:*:*
hcltech notes >= 11.0, <= 11.0.1 cpe:2.3:a:hcltech:notes:*:*:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp10:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp10if1:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp10if2:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp10if3:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp10if4:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp10if5:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp10if6:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp10if7:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp1if1:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp1if2:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp2if1:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp2if2:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp2if3:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp2if4:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp3if1:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp3if2:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp3if3:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp3if4:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp4if1:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp4if2:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp5if1:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp5if2:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp5if3:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp7if1:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp7if2:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp8if1:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp9if1:*:*:*:*:*:*
hcltech notes 9.0.1 cpe:2.3:a:hcltech:notes:9.0.1:fp9if2:*:*:*:*:*:*
hcltech notes 10.0.0 cpe:2.3:a:hcltech:notes:10.0.0:fp1:*:*:*:*:*:*
hcltech notes 10.0.0 cpe:2.3:a:hcltech:notes:10.0.0:fp2:*:*:*:*:*:*
hcltech notes 10.0.0 cpe:2.3:a:hcltech:notes:10.0.0:fp3:*:*:*:*:*:*
hcltech notes 10.0.0 cpe:2.3:a:hcltech:notes:10.0.0:fp4:*:*:*:*:*:*
hcltech notes 10.0.0 cpe:2.3:a:hcltech:notes:10.0.0:fp5:*:*:*:*:*:*
hcltech notes 10.0.1 cpe:2.3:a:hcltech:notes:10.0.1:fp1:*:*:*:*:*:*
hcltech notes 10.0.1 cpe:2.3:a:hcltech:notes:10.0.1:fp2:*:*:*:*:*:*
hcltech notes 10.0.1 cpe:2.3:a:hcltech:notes:10.0.1:fp3:*:*:*:*:*:*
hcltech notes 10.0.1 cpe:2.3:a:hcltech:notes:10.0.1:fp4:*:*:*:*:*:*
hcltech notes 10.0.1 cpe:2.3:a:hcltech:notes:10.0.1:fp5:*:*:*:*:*:*

References for CVE-2020-4097

cvelogic Threat Intelligence