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CVE Record

CVE-2021-1319: 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

This flaw affects several Cisco Small Business RV routers. An attacker with valid administrator credentials could use the web management interface to run code as root or force a restart. The business risk is highest where these routers remain internet-reachable or use weakly controlled admin access.

Executive priority

Treat this as a high-priority legacy network-device risk. It is not cited as actively exploited here, but successful abuse gives root-level control or service disruption after admin credential compromise.

Technical view

CVE-2021-1319 is a high-severity authenticated remote command execution and denial-of-service issue in the web-based management interface of Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 routers. The stated root cause is improper validation of user input, with CWE-121 listed. Exploitation requires administrator credentials.

Likely exposure

Exposure is limited to organizations running the listed Cisco Small Business RV routers, especially where the management interface is reachable by untrusted networks or admin credentials are shared, stale, or compromised.

Exploitation context

The supplied sources do not show CISA KEV listing or active exploitation. Exploitation is remote over HTTP but requires valid administrator credentials, reducing opportunistic risk while keeping post-credential-compromise impact high.

Researcher notes

The key constraints are affected-model confirmation and credential requirement. The bundle does not provide exploit proof, patch versions, or KEV evidence. Avoid assuming unauthenticated exposure or active exploitation without additional vendor or threat-intelligence confirmation.

Mitigation direction

  • Review Cisco advisory cisco-sa-rv-overflow-ghZP68yj for available fixed software or migration guidance.
  • Inventory Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 routers.
  • Restrict web management access to trusted administrator networks.
  • Audit administrator accounts and remove stale or shared credentials.
  • Monitor affected routers for unexpected reloads or unauthorized administrative activity.

Validation and detection

  • Confirm whether any listed Cisco RV router models are deployed.
  • Check whether their web management interfaces are reachable from untrusted networks.
  • Verify current firmware status against Cisco’s advisory guidance.
  • Review administrative account inventory and recent login activity.
  • Look for unexplained device reloads or configuration changes.
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

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.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-1319 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-2021-1319Attack 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.