Security readout for executives and security teams
Plain-English summary
CVE-2021-1330 affects Cisco Small Business RV routers. An attacker with valid administrator credentials could abuse the web management interface to run code as root or force a device restart. The business risk is highest where these routers are internet-reachable or administrator credentials are weak, reused, or compromised.
Executive priority
Treat this as a high-priority network edge risk for affected small business routers. The admin-credential requirement lowers broad opportunistic risk, but compromised credentials could lead to full router control or service disruption.
Technical view
Cisco describes improper input validation in the web-based management interface of RV016, RV042, RV042G, RV082, RV320, and RV325 routers. Crafted HTTP requests from an authenticated remote administrator can trigger arbitrary code execution as root or denial of service. CVSS is 7.2, with high privileges required and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to listed Cisco Small Business RV series routers with vulnerable firmware and reachable web management. Successful exploitation requires valid administrator credentials, so credential compromise, shared admin accounts, or exposed management interfaces materially increase risk.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires authenticated administrative access and crafted HTTP requests to the management interface. Impact can include root-level code execution or device reload, causing outage.
Researcher notes
The CVE maps to CWE-121 and Cisco’s advisory groups multiple management-interface issues. The bundle does not provide exploit availability, exact fixed versions, or detailed affected firmware ranges, so validation should rely on Cisco’s advisory and device-specific inventory.
Mitigation direction
- Consult Cisco’s advisory for affected releases and fixed software guidance.
- Restrict web management access to trusted administrator networks or VPN.
- Disable unnecessary remote management exposure where operationally feasible.
- Audit administrator accounts and rotate credentials if compromise is plausible.
- Prioritize replacement if vendor guidance indicates unsupported hardware.
Validation and detection
- Inventory Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 routers.
- Confirm firmware status against Cisco’s advisory and asset records.
- Check whether management interfaces are reachable from untrusted networks.
- Review router administrator accounts for weak, shared, or stale credentials.
- Look for unexplained device reloads or suspicious administrative access logs.
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-2021-1330 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.