Security readout for executives and security teams
Plain-English summary
Cisco Small Business RV016, RV042, RV042G, RV082, RV320, and RV325 routers have management-interface flaws that can let a logged-in administrator execute operating-system commands as root. This is serious because a compromised admin account could become full device compromise.
Executive priority
Treat as high priority for perimeter and branch-office environments. The attacker needs admin credentials, but successful exploitation means root control of the router, which can affect traffic, availability, and trust boundaries.
Technical view
CVE-2021-1316 is an authenticated remote command injection issue in the web-based management interface, caused by improper validation of user-supplied input. CVSS 3.1 is 7.2 high, with network attack vector, high privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to affected Cisco Small Business RV Series routers where the web management interface is reachable by an attacker who has valid administrator credentials. The bundle does not provide affected firmware version ranges.
Exploitation context
The provided sources do not indicate CISA KEV listing or active exploitation. Exploitation requires valid administrator credentials and crafted HTTP requests to the management interface, with successful exploitation allowing root-level command execution.
Researcher notes
Key uncertainty is version scope: the bundle lists affected products but not precise firmware versions. Validation should focus on management interface exposure, administrative access paths, and Cisco advisory status rather than unauthenticated scanning assumptions.
Mitigation direction
- Review Cisco's advisory for fixed software, workarounds, and device-specific guidance.
- Restrict web management access to trusted administrative networks only.
- Remove internet exposure for affected router management interfaces.
- Audit administrator accounts and rotate credentials where compromise is possible.
- Prioritize replacement planning if vendor guidance shows no supported fixed firmware.
Validation and detection
- Inventory RV016, RV042, RV042G, RV082, RV320, and RV325 routers.
- Confirm whether web-based management is enabled and reachable.
- Verify firmware status against the Cisco advisory.
- Review administrator account list, recent logins, and configuration changes.
- Check whether management access is restricted by network controls.
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-20: 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-2021-1316 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 Command Injection 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.