Security readout for executives and security teams
Plain-English summary
CVE-2020-3203 can let an unauthenticated remote attacker crash certain Cisco Catalyst 9800 wireless controllers by causing memory exhaustion. The likely business impact is wireless service disruption, not theft or modification of data. The source bundle does not show active exploitation evidence.
Executive priority
High priority for organizations dependent on Catalyst 9800 wireless availability. The risk is operational disruption from controller crashes rather than data compromise. Address internet- or untrusted-network-reachable deployments first, then complete Cisco-guided remediation across the fleet.
Technical view
The issue is in the locally significant certificate provisioning feature on Cisco Catalyst 9800 Series Wireless Controllers running IOS XE Software. Incorrect handling of certain PKI-related SSL packets can trigger a memory leak, memory allocation failure, device crash, and denial of service. It maps to CWE-400 and has CVSS 8.6.
Likely exposure
Exposure is most likely where Cisco Catalyst 9800 Series Wireless Controllers use affected IOS XE software and the vulnerable LSC provisioning path is reachable from untrusted networks. The provided affected entry names Cisco IOS XE Software 16.1.1, but the bundle does not enumerate all affected or fixed releases.
Exploitation context
The bundle describes unauthenticated remote exploitation by crafted SSL packets causing memory exhaustion and crash. It does not provide evidence of public exploit activity, and KEV status is false. Treat exploitation status as unconfirmed rather than active.
Researcher notes
Do not infer confidentiality or integrity impact; the CVSS vector shows none. Focus validation on product/version exposure, LSC provisioning reachability, and availability symptoms. The provided bundle lacks detailed fixed-release information, so vendor advisory review is required.
Mitigation direction
- Inventory Cisco Catalyst 9800 Series Wireless Controllers and IOS XE versions.
- Review the Cisco advisory for affected releases and Cisco-supported fixed software.
- Prioritize remediation for controllers supporting critical wireless access.
- Check Cisco guidance before applying configuration-based mitigations.
- Monitor controller memory pressure, crashes, and unexpected reloads until remediated.
Validation and detection
- Confirm whether any Catalyst 9800 controllers run the affected IOS XE release.
- Check whether LSC provisioning is enabled or reachable in deployed configurations.
- Review logs and telemetry for memory exhaustion or crash symptoms.
- Verify remediation status against Cisco advisory guidance.
- Document business-critical wireless sites dependent on affected controllers.
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-400: 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-2020-3203 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
- 8.6 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/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:N/UI:N/S:C/C:N/I:N/A:H3.94Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.6HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200603 Cisco IOS XE Software Catalyst 9800 Series Wireless Controllers Denial of Service 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.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.