What’s Vulnerable › Vulnerabilities

CVE-2020-4102

• Severity: medium (CVSS 6.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-02 · updated 2026-06-17
• Weakness: CWE-120

Description

HCL Notes is susceptible to a Buffer Overflow vulnerability in DXL due to improper validation of user input. A successful exploit could enable an attacker to crash Notes or execute attacker-controlled code on the client system.

Affected products

• HCL Notes: from 9.0.0 through 9.0.1; 10.0, 10.0.1, 10.0.1-fp1, 10.0.1-fp2, 10.0.1-fp3, 10.0.1-fp4 (+3)

References

• https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0085499
• https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0085499

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