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CVE-2021-39041: IBM QRadar SIEM 7.3, 7.4, and 7.5 may be vulnerable to partial denial of service attack, resulting in some...

IBM QRadar SIEM 7.3, 7.4, and 7.5 may be vulnerable to partial denial of service attack, resulting in some protocols not listening to specified ports. IBM X-Force ID: 214028.

LowCVSS 3.7Not KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

CVE-2021-39041 is a low-severity IBM QRadar SIEM issue where some configured protocols may stop listening on their expected ports, causing partial service disruption. It does not indicate data theft or tampering. Business urgency is mainly around monitoring reliability: affected QRadar deployments could miss or delay some inbound log collection paths.

Executive priority

Treat this as a reliability and detection-coverage issue, not a data breach indicator. Remediate during normal patch governance unless QRadar is central to regulated monitoring, incident response, or critical operational telemetry.

Technical view

IBM QRadar SIEM 7.3, 7.4, and 7.5 are listed as affected. The CVSS 3.0 vector is network-accessible, no privileges or user interaction required, high attack complexity, no confidentiality or integrity impact, and low availability impact. IBM X-Force tracks it as ID 214028.

Likely exposure

Exposure is limited to organizations running IBM QRadar SIEM versions 7.3, 7.4, or 7.5. Risk depends on whether affected protocol listeners are configured and reachable on network paths relevant to log ingestion.

Exploitation context

The source bundle does not show active exploitation. It is not marked as KEV, and the CVSS vector lists exploit maturity as unproven. Public evidence provided is insufficient to claim real-world exploitation.

Researcher notes

No CWE is provided in the bundle. Evidence supports partial denial of service only. Avoid assuming a specific protocol, root cause, or exploit path beyond IBM’s description. Use IBM’s advisory and X-Force entry as the authoritative remediation references.

Mitigation direction

  • Review IBM advisory 6602749 for official fixes or guidance.
  • Plan remediation for QRadar SIEM 7.3, 7.4, and 7.5 deployments.
  • Prioritize systems handling critical log ingestion or compliance monitoring.
  • Restrict unnecessary network reachability to QRadar listener ports.
  • Monitor vendor guidance if exact fixed build details are unclear.

Validation and detection

  • Inventory QRadar SIEM versions across all environments.
  • Identify configured protocol listeners and expected ports.
  • Check QRadar health and logs for listeners not binding correctly.
  • Confirm critical log sources continue arriving after remediation.
  • Validate network ACLs limit exposure to required senders.
Prepared
Confidence
high
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-2021-39041 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Low
CVSS
3.7 (3.0)
Known Exploited
No
Published

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

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
3.7CVSS 3.0LowCVSS:3.0/AC:H/C:N/AV:N/S:U/UI:N/A:L/PR:N/I:N/RL:O/E:U/RC:C2.21.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

3.7Low
CVSS 3.0 vector shape for CVE-2021-39041Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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, 7.4, 7.5Listed
Weakness

CWE details

No CWE listed

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