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CVE-2020-4102

18
FAUCET Score

CVE-2020-4102 is a buffer overflow vulnerability in HCL Notes, specifically within its DXL component, caused by insufficient user input validation. This flaw carries a CVSS score of 6.7 (Medium) and could allow an attacker to crash the client application or execute arbitrary code with high impact on confidentiality, integrity, and availability, assuming high privileges are already obtained. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 9.0.0, <= 9.0.1CPE matchmatch criteria
cpe:2.3:a:hcltech:notes:*:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:a:hcltech:notes:10.0:*:*:*:*:*:*:*
10.0.1CPE matchmatch criteria
cpe:2.3:a:hcltech:notes:10.0.1:-:*:*:*:*:*:*
10.0.1CPE matchmatch criteria
cpe:2.3:a:hcltech:notes:10.0.1:fp1:*:*:*:*:*:*
10.0.1CPE matchmatch criteria
cpe:2.3:a:hcltech:notes:10.0.1:fp2:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.7MEDIUM

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
0.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.32%
Probability of exploitation in next 30 days
EPSS Percentile
24.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0032 is in the 72nd percentile among its peer group of 3,720 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

support.hcltechsw.com / csm
Vendor Advisory