CVE-2020-14268

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-12-14 · updated 2026-06-17
Weakness: CWE-787

Description

A vulnerability in the MIME message handling of the Notes client (versions 9 and 10) could potentially be exploited by an unauthenticated attacker resulting in a stack buffer overflow. This could allow a remote attacker to crash the client or inject code into the system which would execute with the privileges of the client.

Affected products

HCL Notes: from 9.0 before 9.0.1; from 10.0 before 10.0.1; 9.0.1, 9.0.1-fp10, 9.0.1-fp10if1, 9.0.1-fp10if2, 9.0.1-fp10if3, 9.0.1-fp10if4 (+27) — fixed in 10.0.1, 9.0.1

How to fix

Upgrade to a fixed version: HCL Notes 10.0.1, 9.0.1. Check the vendor advisory for mitigations.

References

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