Security readout for executives and security teams
Plain-English summary
This flaw affects the web management interface on specific Cisco Small Business RV routers. An attacker with valid administrator credentials could run code as root or crash the router. Cisco reported no software updates for these vulnerabilities, so exposed management access should be treated as a significant operational risk.
Executive priority
High priority for sites still using these router models, especially if management access is remotely reachable. The main business concern is router takeover or outage with no software update identified in the provided sources, making exposure reduction and lifecycle planning important.
Technical view
Improper validation of user-supplied input in crafted HTTP requests to the management interface can trigger arbitrary code execution as root or denial of service. The attack is network-reachable, low complexity, requires high privileges, and needs no user interaction. CVSS 3.1 score is 7.2.
Likely exposure
Exposure is limited to Cisco Small Business RV110W, RV130, RV130W, and RV215W routers running affected firmware. Risk is highest where the web-based management interface is reachable by untrusted networks or where administrator credentials may be shared, reused, or compromised.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires valid administrator credentials and crafted HTTP requests to the management interface. Successful exploitation can fully compromise the router operating system or force a reload.
Researcher notes
The CVE combines authenticated remote command execution and denial of service conditions in the management interface. Evidence provided supports affected products, root-level impact, administrator credential requirement, CVSS 7.2, and no Cisco software update. It does not support unauthenticated exploitation or known active exploitation.
Mitigation direction
- Check Cisco’s advisory for current product guidance and support status.
- Do not expose the management interface to untrusted networks.
- Restrict administrator access to trusted management networks only.
- Review and strengthen administrator credential controls.
- Plan replacement or compensating isolation where no vendor update is available.
Validation and detection
- Inventory Cisco RV110W, RV130, RV130W, and RV215W routers.
- Confirm whether web management is reachable from untrusted networks.
- Verify administrator accounts are limited to authorized personnel.
- Review device logs for unexpected reloads or suspicious administrative activity.
- Document compensating controls for devices without software updates.
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
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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-2021-1202 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.