Security readout for executives and security teams
Plain-English summary
This CVE affects several Cisco Small Business RV routers. An attacker with valid administrator credentials could abuse the web management interface to run code as root or force the device to restart. The business risk is highest where these routers protect branch offices, small sites, or remote access paths.
Executive priority
Treat this as a high-priority edge-device issue, especially for branch or small-office networks. The attacker needs administrator credentials, but compromise of those credentials could lead to root-level device control or service disruption.
Technical view
Cisco describes improper validation of user-supplied input in the web-based management interface. Crafted HTTP requests from an authenticated remote administrator can trigger arbitrary code execution on the underlying OS or a denial-of-service reload. The CVSS 3.1 score is 7.2 because privileges are required but impact is high.
Likely exposure
Exposure is limited to Cisco Small Business RV016, RV042, RV042G, RV082, RV320, and RV325 routers. Risk depends on whether the management interface is reachable by administrators or wider networks, and whether administrator credentials are compromised, shared, or weakly controlled.
Exploitation context
The supplied sources do not show CISA KEV listing or confirmed active exploitation. Exploitation requires valid administrator credentials and network access to the web management interface. Successful exploitation could give root-level control or disrupt routing through a device reload.
Researcher notes
The bundle identifies CWE-121 and authenticated remote attack over the management interface. Exact affected firmware versions, fixed releases, and workaround details are not included in the bundle summary, so Cisco’s advisory is required for precise remediation mapping.
Mitigation direction
- Review Cisco advisory for affected and fixed firmware details.
- Apply Cisco-recommended firmware updates where available.
- Restrict router management access to trusted administrative networks.
- Remove unnecessary administrator accounts and rotate shared credentials.
- Monitor for unexpected router reloads or administrative access.
Validation and detection
- Inventory deployed Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 routers.
- Confirm each device firmware against Cisco advisory guidance.
- Verify the management interface is not broadly reachable.
- Review administrator account lists and recent login activity.
- Check operational logs for unexplained reloads or configuration changes.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
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 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-2021-1345 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
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 Remote Command Execution and Denial of Service 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.
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.