CVE-2021-20379Network attack vector

Sensitive-data decryption via weak cryptographic algorithms

Published Jul 7, 2021 · Updated Sep 16, 2024

Weak cryptography in IBM Guardium Data Encryption 3.0.0.2 and 4.0.0.4 allows remote attackers to decrypt highly sensitive information. IBM identifies only weaker-than-expected cryptographic algorithms and does not disclose the affected component, algorithm, or incorrect operation. The unauthenticated attack requires unspecified high-complexity conditions and exposes protected data without modifying it or interrupting service.

CVSS severity5.9
Medium
EPSS probability0.45%
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 Guardium Data Encryption 3.0.0.2 and 4.0.0.4 allows remote attackers to decrypt highly sensitive information. IBM identifies only weaker-than-expected cryptographic algorithms and does not disclose the affected component, algorithm, or incorrect operation. The unauthenticated attack requires unspecified high-complexity conditions and exposes protected data without modifying it or interrupting service.

The record

CVE
CVE-2021-20379
Published
Jul 7, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
Guardium Data Encryption
Classifications
CWE-327
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 7, 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?

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  1. Affected versionversion=3.0.0.2
  2. Affected versionversion=4.0.0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · Guardium Data Encryptionversion=3.0.0.2; version=4.0.0.4

Published CVSS scores

5.9IBMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/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.

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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-327Use of a Broken or Risky Cryptographic Algorithm

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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