Security readout for executives and security teams
Plain-English summary
Cisco DNA Center could fail to properly verify the certificate used for its Cisco ISE integration. If an attacker can position themselves to supply a crafted certificate and intercept that connection, they may read or change sensitive network-client information maintained by ISE.
Executive priority
Treat as high priority for networks using Cisco DNA Center with ISE, because compromise could expose or alter sensitive client data. Urgency is lower where that integration is absent, but version validation is still needed.
Technical view
CVE-2021-1134 is a CWE-295 certificate validation flaw in Cisco DNA Center Software's ISE integration. CVSS is 7.4 high, with network attack vector, no privileges or user interaction, high confidentiality and integrity impact, and high attack complexity.
Likely exposure
Exposure is most relevant where Cisco DNA Center is deployed and integrated with Cisco Identity Services Engine. The bundle does not provide affected version ranges, so inventory and vendor advisory checks are required.
Exploitation context
The source bundle does not show CISA KEV listing or public active exploitation evidence. Exploitation requires a crafted certificate and interception of DNA Center-to-ISE communications, making network position and integration context important.
Researcher notes
The available data identifies the flaw class and impact but not affected version ranges or patch identifiers. Avoid assuming broad Cisco ISE exposure; the vulnerable component is DNA Center's ISE integration certificate validation path.
Mitigation direction
- Review Cisco's advisory for affected and fixed DNA Center releases.
- Upgrade or remediate according to Cisco's guidance when the deployment is affected.
- Prioritize environments where DNA Center is integrated with Cisco ISE.
- Verify certificate trust configuration for DNA Center-to-ISE connections.
- Monitor vendor guidance if affected version details are unclear.
Validation and detection
- Inventory Cisco DNA Center deployments and enabled ISE integrations.
- Check installed DNA Center versions against Cisco's advisory.
- Review whether DNA Center-to-ISE communication paths are exposed to interception risk.
- Confirm post-remediation that trusted certificate validation is configured as intended.
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-295: 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-2021-1134 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
- High
- CVSS
- 7.4 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N2.25.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.4HighVector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210616 Cisco DNA Center Certificate Validation 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.
Improper Certificate Validation
Improper Certificate Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.