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CVE Record

CVE-2021-1317: Cisco Small Business RV Series Routers Management Interface Command Injection Vulnerabilities

Multiple vulnerabilities in the web-based management interface of Cisco Small Business RV016, RV042, RV042G, RV082, RV320, and RV325 Routers could allow an authenticated, remote attacker to inject arbitrary commands that are executed with root privileges. These vulnerabilities are due to improper validation of user-supplied input in the web-based management interface. An attacker could exploit these vulnerabilities by sending crafted HTTP requests to a targeted device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system. To exploit these vulnerabilities, an attacker would need to have valid administrator credentials on an affected device.

HighCVSS 7.2Not KEV-listedUpdated
Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This flaw lets someone who already has administrator access to certain Cisco Small Business RV routers make the management interface run operating-system commands as root. It is serious because routers sit at network boundaries, but the cited record requires valid administrator credentials and does not show known active exploitation.

Executive priority

Treat as high priority for affected perimeter or branch routers. The business risk is elevated because compromise could provide root control of network infrastructure, but urgency depends on confirmed device presence, management-interface exposure, and administrator credential control.

Technical view

CVE-2021-1317 is improper input validation in the web-based management interface of Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 routers. An authenticated remote administrator can send crafted HTTP requests that cause command execution with root privileges. CVSS v3.1 is 7.2, high, with PR:H and full CIA impact.

Likely exposure

Exposure is limited to organizations running the listed Cisco Small Business RV router models, especially where the web management interface is reachable beyond tightly controlled admin networks. The source bundle does not provide exact firmware version ranges.

Exploitation context

The provided sources require valid administrator credentials. KEV status is false, and the bundle does not cite active exploitation. Successful exploitation would give root-level command execution on the router operating system.

Researcher notes

The evidence supports authenticated command injection, CWE-20, root impact, and high severity. The bundle does not name exact affected firmware versions, fixed versions, workarounds, proof-of-concept status, or active exploitation. Avoid assuming unauthenticated exploitability.

Mitigation direction

  • Check Cisco’s advisory for affected firmware and vendor-approved fixes.
  • Restrict web management access to trusted administrative networks only.
  • Remove unnecessary remote management exposure on affected routers.
  • Review and limit administrator accounts on listed RV devices.
  • Prioritize replacement if vendor-supported fixes are unavailable.

Validation and detection

  • Inventory Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 devices.
  • Confirm whether each device exposes the web management interface.
  • Identify firmware versions and compare them with Cisco advisory guidance.
  • Review admin account ownership and credential hygiene.
  • Check logs for unusual authenticated management activity.
Prepared
Confidence
high
Sources
3

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · low confidence lookup

CWE-20: Exact CWE lookup

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description · low confidence lookup

Execution 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.

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cve · low confidence lookup

CVE-2021-1317 mapping review

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Vulnerability profileCVE Program record
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

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
7.2CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H1.25.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.2High
CVSS 3.1 vector shape for CVE-2021-1317Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone
Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
CiscoCisco Small Business RV Series Router Firmwaren/aListed
Weakness

CWE details

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-20 · source CWE mapping

Improper Input Validation

Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.