Security readout for executives and security teams
Plain-English summary
This is a low-severity information disclosure issue in specific IBM Controller and IBM Cognos Controller versions. A remote attacker may receive detailed technical error messages in the browser, potentially revealing information useful for later attacks. The source bundle does not show active exploitation or a named public exploit.
Executive priority
Treat this as a maintenance and exposure-reduction item, not an emergency. Prioritize it for environments where Controller is internet-accessible, supports sensitive finance processes, or cannot be quickly isolated from untrusted users.
Technical view
CVE-2021-20455 is CWE-209: information exposure through an error message. Affected versions are IBM Cognos Controller 11.0.0 through 11.0.1 and IBM Controller 11.1.0. CVSS 3.1 is 3.7, with network attack vector, high complexity, no privileges, no user interaction, and low confidentiality impact only.
Likely exposure
Exposure is likely limited to organizations still running the listed IBM Controller or Cognos Controller versions, especially where the web interface is reachable from untrusted networks. Other versions are not identified as affected in the provided bundle.
Exploitation context
The bundle marks KEV as false and provides no evidence of active exploitation. The issue could support reconnaissance by leaking implementation details through browser-visible errors, but the recorded attack complexity is high and impact is limited to confidentiality.
Researcher notes
The evidence supports only low-confidence operational impact beyond reconnaissance value. No patch details are included in the provided bundle, so remediation should be anchored to IBM advisory 7179163. Do not assume additional IBM products or versions are affected.
Mitigation direction
- Check IBM advisory for supported fixes, workarounds, or upgrade guidance.
- Inventory IBM Controller and Cognos Controller versions against the affected release list.
- Restrict Controller web access to trusted networks or VPN users where feasible.
- Review configuration to avoid detailed technical errors being shown in browsers.
- Prioritize upgrade or retirement of affected releases if IBM identifies a supported target.
Validation and detection
- Confirm whether IBM Controller 11.1.0 is deployed.
- Confirm whether Cognos Controller 11.0.0 or 11.0.1 is deployed.
- Review IBM advisory 7179163 for exact vendor remediation status.
- Check whether browser-visible errors disclose stack traces, paths, or configuration details.
- Verify Controller endpoints are not unnecessarily exposed to the internet.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-209: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-20455 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N2.21.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.7LowVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.ibm.com/support/pages/node/7179163CVE reference
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.
Generation of Error Message Containing Sensitive Information
Generation of Error Message Containing Sensitive Information represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.