Security readout for executives and security teams
Plain-English summary
CVE-2021-1143 lets an authenticated remote user identify which accounts exist in Cisco Connected Mobile Experiences. It is not described as giving control of the system or changing data, but user enumeration can support follow-on phishing, credential attacks, or privilege targeting.
Executive priority
Treat as a moderate-priority exposure reduction item. It does not indicate system takeover, but it weakens account privacy and can support follow-on attacks if CMX is reachable by broad user groups.
Technical view
Cisco CMX has missing authorization checks for certain API GET requests. With low privileges and network access, an attacker could query affected API behavior to enumerate CMX users. CVSS v3.1 is 4.3, with low confidentiality impact only.
Likely exposure
Exposure is likely limited to organizations running Cisco Connected Mobile Experiences where authenticated users can reach the CMX API. Exact affected versions are not provided in the source bundle.
Exploitation context
The source bundle does not cite active exploitation, and CISA KEV status is false. The vulnerability still matters because it helps an already authenticated attacker map valid users for later attacks.
Researcher notes
Evidence supports CWE-863 improper authorization in CMX API authorization checks. The bundle does not include affected version ranges, patch versions, workaround details, or proof of exploitation, so remediation should be anchored to Cisco’s advisory.
Mitigation direction
- Review Cisco advisory for affected releases and fixed software guidance.
- Restrict CMX API access to trusted administration networks.
- Remove unnecessary CMX accounts and enforce least privilege.
- Monitor authenticated CMX API activity for unusual account discovery patterns.
Validation and detection
- Inventory Cisco Connected Mobile Experiences deployments and API exposure.
- Confirm installed CMX versions against Cisco advisory guidance.
- Review account permissions for users able to access CMX APIs.
- Check logs for unusual authenticated API access around user records.
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-863: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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-2021-1143 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
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/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:L/PR:L/UI:N/S:U/C:L/I:N/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210113 Cisco Connected Mobile Experiences User Enumeration VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
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.
Incorrect Authorization
Incorrect Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.