Security readout for executives and security teams
Plain-English summary
This flaw can make affected Cisco Aironet access points reboot if an unauthenticated person can act as a wired client on the AP Ethernet interface and send malformed traffic. The business impact is wireless service disruption, not data theft. The source bundle does not identify affected version ranges or fixed releases.
Executive priority
Treat as a high-priority availability risk for sites dependent on Cisco Aironet wireless service. It is not described as data compromise, but repeated AP reloads could disrupt operations. Prioritize locations with exposed Ethernet access or critical connectivity needs.
Technical view
CVE-2020-3552 is an insufficient input validation issue in Cisco Aironet Access Point Software Ethernet packet handling. A crafted burst of packets from an adjacent wired client can trigger NULL pointer access and reload the AP. CVSS 3.0 is 7.4 with adjacent attack vector, no privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most likely where Cisco Aironet APs allow wired-client access to the Ethernet interface. The bundle lists the affected product as Cisco Aironet Access Point Software but provides no version or CPE detail, so asset confirmation requires Cisco guidance and local inventory.
Exploitation context
The CVE is not listed as KEV in the supplied data, and the bundle provides no evidence of active exploitation. Exploitation requires adjacent access as a wired client to the AP Ethernet interface, limiting reach but making insider, visitor, or poorly controlled physical-network scenarios relevant.
Researcher notes
Evidence is strongest for impact mechanics and access requirements, but incomplete for affected versions and fixes in the supplied bundle. Avoid assuming internet reachability or active exploitation. Focus validation on product presence, wired-client exposure, and reload telemetry around affected APs.
Mitigation direction
- Review Cisco advisory for affected releases, fixed software, and workarounds.
- Restrict physical and logical access to AP Ethernet interfaces.
- Disable or limit wired-client functionality where it is not required.
- Prioritize remediation on APs serving critical offices or operations.
- Monitor AP reload events until remediation is complete.
Validation and detection
- Inventory Cisco Aironet AP models and software versions.
- Map where AP Ethernet ports can accept wired clients.
- Compare deployed software against Cisco advisory guidance.
- Review controller or AP logs for unexplained reloads.
- Confirm untrusted users cannot connect to AP Ethernet interfaces.
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-476: Exact CWE lookup
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Open ATT&CK lookupCVE-2020-3552 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
- 7.4 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:A/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:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H2.84Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.4HighVector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200924 Cisco Aironet Access Points Ethernet Wired Clients 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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.