Security readout for executives and security teams
Plain-English summary
Cisco DCNM had an authentication bypass in its Device Manager application. A remote unauthenticated attacker could reach hosted URLs and use certain DCNM functions. For executives, the concern is unauthorized interaction with data center network management systems, not just a single endpoint flaw.
Executive priority
High priority for organizations using Cisco DCNM, especially in data center operations. Remediation should be tracked as a management-plane risk because unauthorized DCNM actions could affect network control and operational reliability.
Technical view
CVE-2020-3376 is a CWE-306 missing-authentication issue in Cisco Data Center Network Manager Device Manager. The CVSS 3.1 score is 7.3: network exploitable, low complexity, no privileges, no user interaction, with low confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where Cisco DCNM Device Manager is deployed and reachable from untrusted networks. The provided bundle does not identify exact affected versions, so teams must validate installed DCNM releases against Cisco's advisory.
Exploitation context
The source states exploitation could occur by browsing to hosted URLs in Cisco DCNM. The bundle does not cite CISA KEV listing, active exploitation, public exploit code, or observed in-the-wild attacks.
Researcher notes
Evidence is limited to CVE metadata and Cisco advisory references in the bundle. The affected version field is not specified here. Do not infer broader Cisco products, exploit availability, or patch details beyond vendor guidance.
Mitigation direction
- Review Cisco's advisory for affected releases and vendor-recommended fixes.
- Inventory all Cisco DCNM deployments and ownership.
- Restrict DCNM management access to trusted administrative networks.
- Prioritize remediation where DCNM is reachable from broad internal or external networks.
- Monitor DCNM activity for unexpected administrative actions.
Validation and detection
- Identify Cisco DCNM instances and whether Device Manager is enabled.
- Compare installed DCNM versions against Cisco's advisory.
- Verify Device Manager URLs are not reachable by untrusted users.
- Review logs for unexpected access to DCNM hosted URLs.
- Confirm remediation status in vulnerability management 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-306: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-3376 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
- 7.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
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:N/UI:N/S:U/C:L/I:L/A:L3.93.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- 20200729 Cisco Data Center Network Manager Authentication Bypass 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.
Missing Authentication for Critical Function
Missing Authentication for Critical Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.