CVE-2021-20369Network attack vector

Sensitive-data decryption via undisclosed weak cryptography

Published Jul 13, 2021 · Updated Sep 16, 2024

Weak cryptography in IBM Cloud Pak for Applications 4.3 allows remote attackers to decrypt highly sensitive information. IBM has not published the affected cryptographic component, algorithm, key size, protocol, or operation that protects the data. Exploitation is network-reachable and unauthenticated, requires high attack complexity, and affects confidentiality without reported data alteration or service interruption.

CVSS severity5.9
Medium
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak cryptography in IBM Cloud Pak for Applications 4.3 allows remote attackers to decrypt highly sensitive information. IBM has not published the affected cryptographic component, algorithm, key size, protocol, or operation that protects the data. Exploitation is network-reachable and unauthenticated, requires high attack complexity, and affects confidentiality without reported data alteration or service interruption.

The record

CVE
CVE-2021-20369
Published
Jul 13, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Cloud Pak for Applications
Classifications
CWE-326
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM Cloud Pak for Applicationsversion=4.3

Published CVSS scores

5.2IBMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
5.9IBMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-326Inadequate Encryption Strength

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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