Security readout for executives and security teams
Plain-English summary
CVE-2020-3238 lets a logged-in attacker who can upload Cisco IOx application packages modify files inside the IOx virtual instance. The vendor states the impact does not extend to the physical host device. Business urgency is high where IOx package upload access is broadly granted or weakly controlled.
Executive priority
Prioritize this for Cisco IOx environments that support operational workloads or allow delegated package uploads. The flaw is high severity, but its blast radius is reported as the IOx virtual instance rather than the host device.
Technical view
Cisco IOx Application Framework insufficiently validates user-supplied application packages. An authenticated remote attacker with package upload capability could create or modify arbitrary files within the affected virtual instance. CVSS 3.0 is 8.1, driven by high integrity and availability impact, low attack complexity, and low privileges required.
Likely exposure
Exposure is likely limited to environments running Cisco IOx where users or services can upload application packages. The source bundle does not identify exact affected versions, CPEs, or fixed releases, so teams must verify exposure against Cisco's advisory.
Exploitation context
The provided sources do not report active exploitation, and KEV status is false. Exploitation requires authentication and the ability to upload a malicious IOx application package. The stated impact is confined to the virtual instance running on the device.
Researcher notes
The issue maps to CWE-20 input validation failure. Key unresolved items in the bundle are exact affected versions, fixed releases, and vendor-specific mitigations. Do not assume host compromise; the description explicitly limits impact to the virtual instance.
Mitigation direction
- Review Cisco's advisory for affected releases and fixed software guidance.
- Limit Cisco IOx application package upload rights to trusted administrators.
- Audit existing IOx application packages for unexpected file writes or modifications.
- Monitor IOx virtual instances for integrity or availability changes.
- Remove untrusted packages and follow Cisco remediation instructions.
Validation and detection
- Inventory devices running Cisco IOx and the Cisco Application Framework.
- Identify users or services allowed to upload IOx application packages.
- Compare installed versions and configurations with Cisco's advisory.
- Check IOx virtual instance file integrity and recent package upload history.
- Confirm the hosting device itself shows no unsupported impact indicators.
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-20: Exact CWE lookup
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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-2020-3238 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
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:L/PR:L/UI:N/S:U/C:N/I:H/A:H2.85.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.1HighVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200603 Cisco IOx Application Framework Arbitrary File Creation 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 Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.