Security readout for executives and security teams
Plain-English summary
This flaw affects certain Cisco Small Business wireless access points. An attacker who already has valid administrator credentials could abuse the web management interface to run commands as root on the device. Business urgency is mainly about protecting management access and replacing or updating affected devices per Cisco guidance.
Executive priority
Treat this as a credential-dependent infrastructure risk. It is not evidenced as actively exploited in the provided sources, but successful abuse gives root control of network access points. Prioritize exposed or legacy devices and environments with weak administrative credential hygiene.
Technical view
CVE-2021-1550 is a CWE-77 command injection issue in the web-based management interface of certain Cisco Small Business 100, 300, and 500 Series wireless access points. Improper input validation allows authenticated remote administrators to send crafted HTTP requests that execute arbitrary commands with root privileges. CVSS v3.1 score is 4.7.
Likely exposure
Exposure is likely limited to organizations running affected Cisco Small Business access points with reachable web management interfaces. The vulnerability requires valid administrative credentials, so risk increases where admin portals are internet-accessible, shared credentials are used, or device administration is weakly controlled.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. Exploitation requires authenticated administrative access and crafted HTTP requests to the management interface. Root command execution on a network device can still support persistence, traffic interception, or further internal movement after credential compromise.
Researcher notes
The source bundle does not provide granular affected version ranges or fixed release details beyond the Cisco advisory reference. The high privilege requirement limits opportunistic exploitation, but root command execution makes compromise impact meaningful once administrative credentials are obtained.
Mitigation direction
- Review Cisco advisory for affected models, software status, and vendor remediation guidance.
- Restrict management interfaces to trusted administrative networks or VPN access only.
- Audit and rotate wireless access point administrator credentials.
- Disable or remove unsupported affected devices where Cisco guidance offers no safe upgrade path.
- Monitor device administration events for unexpected configuration or account changes.
Validation and detection
- Inventory Cisco Small Business 100, 300, and 500 Series wireless access points.
- Compare deployed device software and model details against Cisco advisory coverage.
- Confirm web management interfaces are not exposed to untrusted networks.
- Review administrator accounts for shared, stale, or unnecessary privileges.
- Check device logs for unusual administrative access or configuration changes.
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-77: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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 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-2021-1550 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
- Medium
- CVSS
- 4.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
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:L/I:L/A:L1.23.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.7MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- 20210519 Cisco Small Business 100, 300, and 500 Series Wireless Access Points Command Injection 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 Neutralization of Special Elements used in a Command ('Command Injection')
Improper Neutralization of Special Elements used in a Command ('Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.