How severe is CVE-2020-4097?

CVE-2020-4097 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-4097 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-4097?

CVE-2020-4097 primarily affects Hcltech Notes. In total, 39 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-4097?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-4097 published?

CVE-2020-4097 was published on 2020-11-05 and last updated on 2026-06-17.

CVE-2020-4097

CVE-2020-4097 is a medium-severity vulnerability in Hcltech Notes with a CVSS 3.x base score of 6.8. 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-120.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 4.6
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Hcltech Notes
Published: 2020-11-05
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-4097?: CVE-2020-4097 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-4097 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-4097?: CVE-2020-4097 primarily affects Hcltech Notes. In total, 39 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-4097?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-4097 published?: CVE-2020-4097 was published on 2020-11-05 and last updated on 2026-06-17.

References

https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0084796

Affected products (39)

cpe:2.3:a:hcltech:notes:*:*:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp10:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp10if1:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp10if2:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp10if3:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp10if4:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp10if5:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp10if6:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp10if7:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp1if1:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp1if2:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp2if1:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp2if2:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp2if3:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp2if4:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp3if1:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp3if2:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp3if3:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp3if4:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp4if1:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp4if2:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp5if1:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp5if2:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp5if3:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp7if1:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp7if2:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp8if1:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp9if1:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:9.0.1:fp9if2:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:10.0.0:fp1:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:10.0.0:fp2:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:10.0.0:fp3:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:10.0.0:fp4:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:10.0.0:fp5:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:10.0.1:fp1:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:10.0.1:fp2:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:10.0.1:fp3:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:10.0.1:fp4:*:*:*:*:*:*
cpe:2.3:a:hcltech:notes:10.0.1:fp5:*:*:*:*:*:*

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