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CVE Record

CVE-2021-1346: Cisco Small Business RV Series Routers Management Interface Remote Command Execution and Denial of Service 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 execute arbitrary code or cause an affected device to restart unexpectedly. 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 an affected device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system or cause the device to reload, resulting in a denial of service (DoS) condition. To exploit these vulnerabilities, an attacker would need to have valid administrator credentials on the affected device.

HighCVSS 7.2Not KEV-listedUpdated
Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Cisco disclosed management-interface flaws in several Small Business RV routers. If an attacker already has administrator credentials, they could take over the router as root or crash it. Business risk is highest where these routers remain deployed and management access is reachable.

Executive priority

Prioritize remediation for any affected router still protecting business networks, especially if management access is exposed. The high impact is tempered by required administrator credentials, but credential compromise would turn this into a device-takeover risk.

Technical view

CVE-2021-1346 covers improper input validation in the web-based management interface of Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 routers. Authenticated remote administrators can trigger arbitrary code execution as root or denial of service. CVSS 3.1 is 7.2 with high privileges required.

Likely exposure

Exposure is limited to affected Cisco Small Business RV Series routers with accessible web management interfaces and valid administrator credentials available to an attacker. The source bundle does not provide affected firmware version ranges.

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. Treat compromised admin credentials or exposed management interfaces as meaningful risk multipliers.

Researcher notes

The bundle identifies affected models, impact, CVSS, CWE-121, and administrator-authenticated attack precondition, but does not include exact vulnerable firmware ranges or named fixed versions. Avoid claiming exploitation without additional KEV or vendor evidence.

Mitigation direction

  • Identify all listed Cisco RV router models in use.
  • Check Cisco advisory guidance for fixed firmware or supported replacement options.
  • Restrict management interface access to trusted administrative networks.
  • Review and rotate router administrator credentials where exposure is possible.
  • Monitor affected devices for unexpected reloads or unauthorized configuration changes.

Validation and detection

  • Inventory RV016, RV042, RV042G, RV082, RV320, and RV325 devices.
  • Record firmware versions and compare them against Cisco advisory guidance.
  • Confirm web management interfaces are not broadly reachable.
  • Validate administrator accounts are current, necessary, and protected.
  • Review logs for unexpected restarts or suspicious administrative activity.
Prepared
Confidence
medium
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

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.

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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-2021-1346 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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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-2021-1346Attack 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-121 · source CWE mapping

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.