Security readout for executives and security teams
Plain-English summary
This flaw affects certain Cisco industrial routers. An attacker already on an adjacent network could send malicious signaling packets and run root-level shell commands on the router’s Virtual Device Server. Cisco warns that because these devices use a hypervisor design, compromise of this channel could lead to complete system compromise.
Executive priority
Treat this as high priority for industrial networks because a nearby attacker could gain root command execution and potentially compromise the full router platform. Urgency depends on whether affected models are deployed on reachable operational networks.
Technical view
CVE-2020-3205 is an inter-VM channel command injection in Cisco IOS Software for Cisco 809/829 Industrial ISRs and CGR1000 routers. Insufficient validation of packets destined for VDS allows unauthenticated adjacent attackers to execute arbitrary Linux shell commands as root on VDS. CVSS v3.0 is 8.8, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely in industrial or connected-grid environments using Cisco 809, 829, or CGR1000 routers with affected Cisco IOS software. The attack vector is adjacent network access, not remote internet access according to the CVSS vector.
Exploitation context
The provided sources do not state active exploitation, and this CVE is not marked as CISA KEV in the bundle. Exploitation requires adjacent network position and malicious packets to the affected device’s VDS signaling path.
Researcher notes
The strongest evidence is Cisco’s vendor advisory and CVE record. The bundle names command injection, root execution on VDS, adjacent attack vector, and possible complete system compromise. It does not provide exploit availability, active exploitation evidence, or specific fixed versions in the supplied text.
Mitigation direction
- Identify Cisco 809, 829 Industrial ISR, and CGR1000 devices in operational networks.
- Check Cisco’s advisory for affected and fixed software guidance before changing production routers.
- Prioritize remediation for devices reachable from shared industrial or field networks.
- Restrict adjacent network access where operationally approved until vendor remediation is complete.
- Monitor Cisco guidance for any updated workaround or fixed-release details.
Validation and detection
- Confirm router model and Cisco IOS version against the Cisco advisory.
- Review network placement to determine who has adjacent access to affected devices.
- Check whether vulnerable devices are deployed in critical industrial or grid environments.
- Verify remediation status against Cisco’s published advisory, not inferred package versions.
- Document residual exposure where change windows delay updates.
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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-3205 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
- 8.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.8HighVector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200603 Cisco IOS Software for Cisco Industrial Routers Virtual Device Server Inter-VM Channel Command Injection 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.