Security readout for executives and security teams
Plain-English summary
Cisco disclosed management-interface flaws in several Small Business RV routers. If an attacker already has administrator credentials, they could take over the router as root or crash it. Business risk is highest where these routers remain deployed and management access is reachable.
Executive priority
Prioritize remediation for any affected router still protecting business networks, especially if management access is exposed. The high impact is tempered by required administrator credentials, but credential compromise would turn this into a device-takeover risk.
Technical view
CVE-2021-1346 covers improper input validation in the web-based management interface of Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 routers. Authenticated remote administrators can trigger arbitrary code execution as root or denial of service. CVSS 3.1 is 7.2 with high privileges required.
Likely exposure
Exposure is limited to affected Cisco Small Business RV Series routers with accessible web management interfaces and valid administrator credentials available to an attacker. The source bundle does not provide affected firmware version ranges.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires authenticated administrator access and crafted HTTP requests to the management interface. Treat compromised admin credentials or exposed management interfaces as meaningful risk multipliers.
Researcher notes
The bundle identifies affected models, impact, CVSS, CWE-121, and administrator-authenticated attack precondition, but does not include exact vulnerable firmware ranges or named fixed versions. Avoid claiming exploitation without additional KEV or vendor evidence.
Mitigation direction
- Identify all listed Cisco RV router models in use.
- Check Cisco advisory guidance for fixed firmware or supported replacement options.
- Restrict management interface access to trusted administrative networks.
- Review and rotate router administrator credentials where exposure is possible.
- Monitor affected devices for unexpected reloads or unauthorized configuration changes.
Validation and detection
- Inventory RV016, RV042, RV042G, RV082, RV320, and RV325 devices.
- Record firmware versions and compare them against Cisco advisory guidance.
- Confirm web management interfaces are not broadly reachable.
- Validate administrator accounts are current, necessary, and protected.
- Review logs for unexpected restarts or suspicious administrative 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-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-2021-1346 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
- 20210203 Cisco Small Business RV Series 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.
