Security readout for executives and security teams
Plain-English summary
This flaw affects Cisco Small Business RV routers. An attacker who already has valid administrator credentials could use the router’s web management interface to run code as root or force a restart. Business urgency is highest where these routers are still deployed and management access is reachable beyond tightly controlled admin networks.
Executive priority
Treat this as a high-priority edge-device risk if affected routers remain in service. Prioritize verification and vendor-guided remediation because compromise could affect network availability and device control, even though the known attack path requires administrator credentials.
Technical view
CVE-2021-1342 covers improper validation of user input in the web-based management interface of listed Cisco Small Business RV routers. The CVSS 3.1 score is 7.2, with network access, low complexity, and high privileges required. Successful exploitation could cause root-level code execution or denial of service through device reload.
Likely exposure
Exposure is most likely in environments using Cisco RV016, RV042, RV042G, RV082, RV320, or RV325 routers with active web management. Risk is reduced when management access is limited to trusted administrative networks and administrator credentials are tightly controlled.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires valid administrator credentials, but impact is severe because successful abuse can execute code as root or restart the device.
Researcher notes
Key constraints are PR:H, UI:N, AV:N, and scope unchanged. The source bundle lists affected versions as n/a, so product and firmware validation should rely on Cisco’s advisory. No exploit-in-the-wild evidence is provided in the supplied data.
Mitigation direction
- Check Cisco’s advisory for fixed software, workarounds, and device-specific guidance.
- Restrict web management access to trusted administrative networks only.
- Disable remote management if it is not operationally required.
- Review and rotate router administrator credentials where exposure is possible.
- Monitor affected routers for unexpected reloads or suspicious administrative activity.
Validation and detection
- Inventory Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 routers.
- Confirm whether each device exposes the web-based management interface.
- Verify who has administrator credentials for each affected router.
- Compare device firmware and support status against Cisco’s advisory.
- Review logs for unexpected restarts or unusual authenticated management 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
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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-2021-1342 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.