Security readout for executives and security teams
Plain-English summary
Cisco ISE has a management-interface flaw that can let a logged-in read-only administrator download files that should be restricted. This is not described as unauthenticated or actively exploited, but ISE often supports identity and access decisions, so unauthorized file access can still carry business risk.
Executive priority
Prioritize as a moderate access-control issue. It requires authenticated administrative read-only access, reducing likelihood, but the affected platform is security-sensitive. Track remediation through normal vulnerability management unless local exposure or suspicious administrative activity raises urgency.
Technical view
CVE-2021-40123 affects Cisco Identity Services Engine Software. Incorrect permissions on an affected device allow an authenticated remote attacker with administrative read-only privileges to download restricted files through the web-based management interface. CVSS v3.1 is 4.3, with network attack vector, low complexity, low privileges, no user interaction, and confidentiality-only impact.
Likely exposure
Exposure is most likely where Cisco ISE web management is reachable by users with administrative read-only privileges. The source bundle does not provide affected version ranges or CPEs, so inventory confirmation must rely on Cisco guidance and local asset records.
Exploitation context
The provided sources describe a crafted HTTP request by an authenticated read-only administrator. CISA KEV status is false in the bundle, and no cited source here states active exploitation. Evidence does not support treating this as internet-scale unauthenticated exploitation.
Researcher notes
Evidence is limited to the CVE record and Cisco advisory reference. Do not assume specific affected versions, patches, or exploit availability beyond the supplied bundle. Validation should focus on management-plane exposure, role assignments, and Cisco’s official advisory details.
Mitigation direction
- Check Cisco’s advisory for affected releases and fixed software guidance.
- Restrict ISE management access to trusted administrative networks.
- Review read-only administrative accounts for necessity and least privilege.
- Monitor Cisco guidance for any updated remediation details.
Validation and detection
- Identify all Cisco ISE deployments and their software versions.
- Confirm whether the web management interface is reachable remotely.
- Review administrative read-only accounts and recent access patterns.
- Check logs for unusual restricted-file download attempts or management requests.
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-266: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2021-40123 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
- 20211020 Cisco Identity Services Engine File Download 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 Privilege Assignment
Incorrect Privilege Assignment represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.