Security readout for executives and security teams
Plain-English summary
Cisco DCNM has an authenticated path traversal flaw in a REST API endpoint. A low-privileged remote user could list or overwrite arbitrary files on the device. Cisco released software updates and states there are no workarounds. Business urgency is moderate because exploitation requires authentication and user interaction, but DCNM is a high-value network management system.
Executive priority
Treat as a scheduled but important remediation for DCNM environments. Prioritize faster if DCNM is reachable by broad internal user groups or manages critical network infrastructure.
Technical view
CVE-2020-3538 is an insufficient path restriction enforcement issue in Cisco Data Center Network Manager Software. The CVSS 3.1 score is 4.6 with network access, low attack complexity, low privileges, user interaction required, and low confidentiality and integrity impact. Successful exploitation could list or overwrite arbitrary files on the affected device.
Likely exposure
Exposure is limited to organizations running Cisco Data Center Network Manager Software. The source bundle does not provide affected version ranges, so teams must compare deployed DCNM versions with Cisco’s advisory and asset inventory.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires an authenticated remote attacker and crafted HTTP requests to a vulnerable REST API endpoint. No public exploit status is established from the provided sources.
Researcher notes
Evidence is incomplete on affected versions and exploitation in the supplied bundle. Cisco’s advisory is the primary source for fixed releases. Avoid assuming impact beyond arbitrary file listing or overwrite on affected DCNM devices.
Mitigation direction
- Identify Cisco DCNM deployments and confirm installed software versions.
- Apply Cisco software updates that address this vulnerability.
- Do not rely on workarounds; Cisco states none are available.
- Restrict DCNM API access to trusted administrators and management networks.
- Review DCNM logs for suspicious file access or overwrite activity.
Validation and detection
- Confirm the asset is Cisco Data Center Network Manager Software.
- Compare the installed DCNM version against Cisco’s advisory guidance.
- Verify the remediated system is running Cisco’s fixed software.
- Review access controls for authenticated DCNM API users.
- Check logs for abnormal REST API requests or file-system errors.
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
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CWE-20: 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-3538 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N/RL:X/RC:X/E:X
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:R/S:U/C:L/I:L/A:N/RL:X/RC:X/E:X2.12.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.6MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N/RL:X/RC:X/E:X
Source materials
- CVE List V5 sourceCVE List V5
- cisco-sa-dcnm-pa-trav-bMdfSTTqCVE reference
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-tls-dos-xW53TBhbCVE reference
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-dcnm-authbypass-YVJzqgk2CVE 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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.