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CVE Record

CVE-2021-20337: IBM QRadar SIEM 7.3.0 to 7.3.3 Patch 8 and 7.4.0 to 7.4.3 GA uses weaker than expected cryptographic algori...

IBM QRadar SIEM 7.3.0 to 7.3.3 Patch 8 and 7.4.0 to 7.4.3 GA uses weaker than expected cryptographic algorithms that could allow an attacker to decrypt highly sensitive information. IBM X-Force ID: 194448.

MediumCVSS 5.9Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

IBM QRadar SIEM used weaker cryptography than expected in listed 7.3.x and 7.4.x releases. The main business risk is disclosure of highly sensitive information if an attacker can decrypt protected data. The CVSS score is medium, but confidentiality impact is high.

Executive priority

Schedule remediation through the normal vulnerability program, with higher priority for QRadar systems protecting sensitive environments. This is not sourced as exploited, but it affects confidentiality in a core security monitoring platform.

Technical view

CVE-2021-20337 affects IBM QRadar SIEM 7.3.0 through 7.3.3 Patch 8 and 7.4.0 through 7.4.3 GA. CVSS 3.0 is 5.9: network reachable, no privileges, no user interaction, high attack complexity, high confidentiality impact, no integrity or availability impact.

Likely exposure

Exposure is likely limited to organizations running the affected IBM QRadar SIEM versions. Internet exposure is not stated in the sources, so prioritize version inventory and cryptographic risk review rather than assuming broad external reachability.

Exploitation context

The provided sources do not report active exploitation, and the CVE is not marked KEV. The CVSS exploit maturity signal is unproven. Attack complexity is high, but successful exploitation could expose highly sensitive information.

Researcher notes

Evidence identifies weak cryptographic algorithms but does not provide protocol details, exploit mechanics, or exact patched versions in the supplied bundle. Avoid assuming exploitability beyond the CVSS vector and IBM references.

Mitigation direction

  • Review IBM advisory 6474847 for the official remediation path.
  • Apply IBM's recommended fix or upgrade for affected QRadar SIEM releases.
  • Prioritize systems handling regulated or high-value security telemetry.
  • Restrict network access to QRadar management and related services where possible.
  • Monitor IBM X-Force entry 194448 for updated guidance.

Validation and detection

  • Inventory QRadar SIEM deployments and record exact version and patch level.
  • Confirm whether any instance runs affected 7.3.x or 7.4.x releases.
  • Check change records for IBM-recommended remediation completion.
  • Review exposure of QRadar interfaces to untrusted networks.
  • Document residual risk if remediation cannot be applied promptly.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-20337 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.9 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/S:U/PR:N/AV:N/UI:N/C:H/AC:H/I:N/A:N/RC:C/E:U/RL:O

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.9CVSS 3.0MediumCVSS:3.0/S:U/PR:N/AV:N/UI:N/C:H/AC:H/I:N/A:N/RC:C/E:U/RL:O2.23.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

5.9Medium
CVSS 3.0 vector shape for CVE-2021-20337Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/S:U/PR:N/AV:N/UI:N/C:H/AC:H/I:N/A:N/RC:C/E:U/RL:O

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
IBMQRadar SIEM7.3.0, 7.4.0, 7.4.3, 7.3.Patch.8Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.