Security readout for executives and security teams
Plain-English summary
This CVE describes username enumeration in IBM Security Identity Manager. An unauthenticated remote user may distinguish valid from invalid login attempts based on different responses. Business impact is limited, but it can help attackers build targeted credential attacks against identity infrastructure.
Executive priority
Treat as a low-severity hygiene item for identity infrastructure. It is not evidence of compromise, but should be remediated because username discovery can increase the success of later credential attacks.
Technical view
The source describes a network-reachable, unauthenticated information disclosure issue caused by inconsistent login responses. CVSS 3.7 indicates high attack complexity, low confidentiality impact, and no integrity or availability impact. The bundle conflicts on affected version: the description names 7.0.2, while the affected field lists 6.0.2.
Likely exposure
Exposure is most likely where IBM Security Identity Manager login functionality is reachable by untrusted users. Version evidence is inconsistent in the provided bundle, so teams should verify deployed versions against IBM's advisory before scoping.
Exploitation context
The bundle does not show CISA KEV listing or cited active exploitation. CVSS exploit maturity is listed as unproven. The practical risk is attacker reconnaissance: confirmed usernames can support phishing, password spraying, or helpdesk social engineering.
Researcher notes
Key uncertainty is affected-version scope: the description says 7.0.2, while the affected object lists 6.0.2. Do not assume broader product impact from this bundle alone. Validate against IBM's advisory and X-Force entry.
Mitigation direction
- Review IBM advisory for affected and fixed versions.
- Apply IBM-supported remediation or update for affected deployments.
- Limit external access to identity manager login surfaces where feasible.
- Monitor authentication telemetry for username probing patterns.
Validation and detection
- Inventory IBM Security Identity Manager deployments and exposed login endpoints.
- Verify installed versions against IBM advisory details.
- Confirm whether 7.0.2, 6.0.2, or both are in scope.
- Review logs for repeated valid-versus-invalid username testing patterns.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-2021-29687 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Low
- CVSS
- 3.7 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/A:N/AV:N/I:N/AC:H/C:L/S:U/UI:N/PR:N/E:U/RC:C/RL:O
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.
CVSS vector scores
1 official scoreWe 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.
CVSS:3.0/A:N/AV:N/I:N/AC:H/C:L/S:U/UI:N/PR:N/E:U/RC:C/RL:O2.21.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
3.7LowVector: CVSS:3.0/A:N/AV:N/I:N/AC:H/C:L/S:U/UI:N/PR:N/E:U/RC:C/RL:O
Source materials
- CVE List V5 sourceCVE List V5
- https://www.ibm.com/support/pages/node/6454605CVE reference · x_refsource_CONFIRM
- ibm-sim-cve202129687-info-disc (200018)CVE reference · vdb-entry, x_refsource_XF
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.