Security readout for executives and security teams
Plain-English summary
This affects Cisco Small Business RV110W, RV130, RV130W, and RV215W routers. An attacker who already has administrator credentials can send malicious management-interface requests to run code as root or crash the device. Cisco states no software updates are available. Business risk is highest where management interfaces are exposed or administrator credentials are weak, shared, or compromised.
Executive priority
Prioritize this as high for any deployed affected router, especially internet-reachable devices. Cisco reported no software updates, so the immediate business action is exposure reduction, credential hygiene, monitoring, and replacement planning where the router remains operationally important.
Technical view
The vulnerability is in the web-based management interface and stems from improper validation of user-supplied input. An authenticated remote administrator can send crafted HTTP requests, potentially causing root-level arbitrary code execution or a device reload denial of service. CVSS 3.1 is 7.2: network attack vector, low complexity, high privileges required, no user interaction, and high CIA impact.
Likely exposure
Exposure is limited to organizations running the listed Cisco Small Business router models. The source bundle does not provide precise firmware version ranges. Practical exposure rises sharply if the management interface is reachable from untrusted networks or if administrator credentials may be reused, shared, default, or compromised.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not marked as CISA KEV. Exploitation requires valid administrator credentials, which reduces drive-by risk but does not reduce post-compromise impact. A successful attack could give root control of the router or cause service interruption.
Researcher notes
The source bundle attributes impact to authenticated crafted HTTP requests against the management interface. It cites root-level code execution and denial of service, but does not include affected firmware ranges, proof-of-concept status, exploitation telemetry, or a vendor patch. Avoid assuming unauthenticated exploitation or broader Cisco product impact.
Mitigation direction
- Check Cisco’s advisory for current product status and guidance.
- Restrict web management access to trusted administrator networks only.
- Disable remote management if it is not operationally required.
- Rotate administrator credentials and remove shared or default accounts.
- Segment or replace affected routers where no vendor update exists.
- Monitor for unexpected reloads and suspicious management-interface activity.
Validation and detection
- Inventory Cisco RV110W, RV130, RV130W, and RV215W routers.
- Confirm whether each management interface is reachable from untrusted networks.
- Review administrator accounts for default, shared, stale, or reused credentials.
- Check device logs for unexpected reloads or unusual administrative requests.
- Verify firewall rules limit management access to approved sources.
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-121: 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 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-2021-1211 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
- 20210113 Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers Management Interface Remote Command Execution and Denial of Service 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.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.