Security readout for executives and security teams
Plain-English summary
This flaw affects the management interface on several Cisco Small Business RV routers. An attacker with valid administrator credentials could send crafted web requests that run code as root or force the router to restart, disrupting connectivity.
Executive priority
Treat as high priority for affected branch or small-office routers because compromise could give root-level device control. Urgency is highest when management access is exposed beyond trusted administrators or admin credentials may be weak or reused.
Technical view
CVE-2021-1348 is an authenticated remote command execution and denial-of-service issue caused by improper validation of user-supplied input in the web-based management interface. Cisco lists RV016, RV042, RV042G, RV082, RV320, and RV325 routers as affected. CVSS 3.1 score is 7.2 with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most relevant where affected Cisco RV management interfaces are reachable by administrators or remote networks. The attack requires valid administrator credentials, so compromised admin accounts, shared passwords, or exposed management portals materially increase risk.
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. Successful exploitation can run code as root or trigger device reloads.
Researcher notes
Key constraints are authenticated access and high privileges. The source bundle confirms affected models and impact but does not provide exploit status, proof-of-concept details, or specific fixed firmware versions. Validate against Cisco’s advisory before making product-specific remediation claims.
Mitigation direction
- Check Cisco’s advisory for fixed firmware and model-specific remediation guidance.
- Prioritize remediation for internet-reachable or remotely administered affected routers.
- Review and rotate administrator credentials for affected devices.
- Restrict management interface access to trusted administrative networks where feasible.
- Replace devices if vendor-supported remediation is unavailable.
Validation and detection
- Inventory Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 routers.
- Confirm firmware exposure against Cisco’s advisory and internal asset records.
- Identify whether the web management interface is reachable from untrusted networks.
- Audit administrator accounts for weak, shared, or stale credentials.
- Review logs for unexpected administrative web requests or unexplained reloads.
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
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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-2021-1348 mapping review
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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.