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CVE Record

CVE-2021-29849: IBM QRadar SIEM 7.3 and 7.4 is vulnerable to cross-site scripting.

IBM QRadar SIEM 7.3 and 7.4 is vulnerable to cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session. IBM X-Force ID: 205281.

MediumCVSS 5.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

IBM QRadar SIEM versions 7.3 and 7.4 have a cross-site scripting flaw in the Web UI. A user could embed JavaScript that changes what another trusted session sees and may expose credentials. This is not a system takeover issue, but it matters because QRadar is a security monitoring platform.

Executive priority

Schedule remediation in the normal vulnerability cycle, with faster handling for internet-adjacent or broadly accessible QRadar consoles. The business concern is credential exposure or UI manipulation inside a security operations tool, not direct infrastructure compromise based on the supplied evidence.

Technical view

CVE-2021-29849 is a network-reachable XSS issue in IBM QRadar SIEM 7.3 and 7.4. The CVSS 3.0 score is 5.4 with low complexity, low privileges required, user interaction required, changed scope, and low confidentiality and integrity impact. Availability impact is listed as none.

Likely exposure

Exposure is likely limited to organizations running IBM QRadar SIEM 7.3 or 7.4 with users accessing the Web UI. Risk is higher where many analysts or administrators use shared dashboards, cases, reports, or other UI content areas that may display user-provided data.

Exploitation context

The source bundle does not show CISA KEV listing or active exploitation. The described attack requires a user able to place script content in the QRadar Web UI and another trusted session to interact with or render it. Treat this as credible but not confirmed exploited in the wild from the supplied evidence.

Researcher notes

Sources identify XSS in QRadar SIEM 7.3 and 7.4, IBM X-Force ID 205281. The CVSS vector indicates PR:L and UI:R, so validation should focus on affected version presence, patch state, UI access boundaries, and whether user-controlled content is rendered in trusted sessions.

Mitigation direction

  • Check IBM’s advisory for the official remediation for QRadar SIEM 7.3 and 7.4.
  • Prioritize upgrading or applying IBM-provided fixes on affected QRadar deployments.
  • Restrict QRadar Web UI access to trusted networks and authorized users.
  • Review QRadar roles and remove unnecessary low-privilege accounts.
  • Monitor IBM X-Force and vendor support notes for revised guidance.

Validation and detection

  • Inventory QRadar SIEM instances and confirm whether versions 7.3 or 7.4 are present.
  • Verify the IBM advisory remediation has been applied to each affected instance.
  • Review Web UI exposure paths, including VPN, SSO, reverse proxy, and internal network access.
  • Inspect recent QRadar UI activity for suspicious stored script-like content.
  • Confirm analyst and administrator accounts use least privilege.
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-2021-29849 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.4 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/S:C/UI:R/AV:N/A:N/C:L/I:L/AC:L/PR:L/E:H/RL:O/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
5.4CVSS 3.0MediumCVSS:3.0/S:C/UI:R/AV:N/A:N/C:L/I:L/AC:L/PR:L/E:H/RL:O/RC:C2.32.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

5.4Medium
CVSS 3.0 vector shape for CVE-2021-29849Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/S:C/UI:R/AV:N/A:N/C:L/I:L/AC:L/PR:L/E:H/RL:O/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, 7.4Listed
Weakness

CWE details

No CWE listed

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