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CVE Record

CVE-2021-1325: 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. A remote attacker with valid administrator credentials could abuse the web management interface to run code as root or force the router to restart. Business urgency is highest where these devices support branch connectivity or expose management access broadly.

Executive priority

Treat this as high priority for affected routers because compromise could give root control over network edge devices. Prioritize internet- or partner-reachable management interfaces and environments with weak administrator credential hygiene.

Technical view

CVE-2021-1325 is an authenticated network flaw in Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 router firmware. Cisco attributes it to improper validation of user input in the web-based management interface, with CWE-121 listed. Successful exploitation can cause root-level code execution or denial of service.

Likely exposure

Exposure is likely limited to organizations still running the listed Cisco Small Business RV models with reachable web management interfaces. The attacker needs valid administrator credentials, so stolen, reused, or shared router admin accounts materially increase risk.

Exploitation context

The bundle does not show CISA KEV listing or active exploitation evidence. Exploitation is described as authenticated and remote, using crafted HTTP requests against the management interface. Impact is serious because successful exploitation reaches root privileges or device reload.

Researcher notes

Evidence supports high impact but authenticated preconditions. The source bundle does not provide fixed version details, exploit availability, or confirmed exploitation. Validation should focus on product inventory, management-plane exposure, firmware alignment with Cisco guidance, and privileged account review.

Mitigation direction

  • Identify whether any listed Cisco RV models remain deployed.
  • Review Cisco's advisory for fixed firmware, workarounds, and product-specific guidance.
  • Restrict router management interfaces to trusted administrative networks only.
  • Review and rotate administrator credentials where exposure is suspected.
  • Retire unsupported or unpatchable affected devices after vendor guidance review.

Validation and detection

  • Inventory edge and branch routers for RV016, RV042, RV042G, RV082, RV320, and RV325 models.
  • Confirm firmware status against Cisco's advisory and internal asset records.
  • Verify management interfaces are not broadly reachable from untrusted networks.
  • Review admin account lists for stale, shared, or unnecessary privileged access.
  • Check logs for unexpected administrative sessions or device reloads.
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.

Open ATT&CK lookup
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-2021-1325 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-2021-1325Attack 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.