Security readout for executives and security teams
Plain-English summary
CVE-2021-1542 covers flaws in the Cisco Small Business 220 Series switch web management interface. A highly privileged attacker could potentially take over a session, run root-level commands, or inject web content. This is high business risk where these switches are still used for office or branch networking.
Executive priority
Treat this as a high-priority network infrastructure exposure, especially for branch or small office environments. Remediation urgency depends on whether affected switches remain deployed and how reachable their management interfaces are.
Technical view
Cisco describes multiple web-based management interface vulnerabilities affecting Cisco Small Business 220 Series Smart Plus Switches. The CVSS 3.1 score is 7.2, with network attack vector, low complexity, high privileges required, no user interaction, and high confidentiality, integrity, and availability impact. CWE-287 is listed.
Likely exposure
Exposure is most likely in environments running Cisco Small Business 220 Series Smart Plus Switches with the web management interface enabled. The source bundle does not provide specific affected firmware versions or CPEs.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. CVSS indicates exploitation requires network access and high privileges, but successful exploitation could have root-level device impact.
Researcher notes
Evidence is limited to the CVE metadata and Cisco advisory reference. The bundle names severe outcomes but does not include version granularity, exploit observations, or concrete fixed-release details. Avoid assuming exploitation or exact firmware impact without the vendor advisory.
Mitigation direction
- Check Cisco’s advisory for fixed releases and official remediation guidance.
- Inventory Cisco Small Business 220 Series Smart Plus Switches in use.
- Restrict web management access to trusted administrative networks.
- Disable external or unnecessary access to the management interface.
- Prioritize replacement if Cisco guidance shows no supported fix path.
Validation and detection
- Confirm whether any Cisco 220 Series Smart Plus Switches are deployed.
- Record current firmware versions and compare them with Cisco advisory guidance.
- Verify web management is not reachable from untrusted networks.
- Review administrative accounts for unnecessary high-privilege access.
- Check monitoring for unexpected configuration or management activity.
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-287: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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-2021-1542 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
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/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:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H1.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20210616 Cisco Small Business 220 Series Smart Switches VulnerabilitiesCVE 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 Authentication
Improper Authentication represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.