Security readout for executives and security teams
Plain-English summary
This affects several Cisco Small Business RV router models. An attacker who already has administrator credentials could abuse the web management interface to run code as root or force a router reload. Business risk is highest where these routers still protect offices, branches, or remote access paths.
Executive priority
Treat as a priority infrastructure hygiene issue, especially for internet-adjacent or branch routers. The admin-credential requirement lowers broad opportunistic risk, but successful abuse could give root-level device control or disrupt connectivity.
Technical view
CVE-2021-1334 is a high-severity authenticated remote command execution and denial-of-service issue in Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 management interfaces. Cisco attributes it to improper validation of user-supplied input. CVSS 3.1 is 7.2 with high privileges required and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure depends on whether affected Cisco Small Business RV routers are still deployed and whether their web-based management interface is reachable by administrators or networks an attacker can access.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Exploitation requires valid administrator credentials and crafted HTTP requests to the management interface, so stolen or shared admin access materially changes risk.
Researcher notes
Evidence supports authenticated RCE and DoS via the web management interface, with CWE-121 listed. The bundle does not include fixed version details, exploit maturity, or workaround specifics beyond the Cisco advisory reference.
Mitigation direction
- Inventory the listed Cisco RV router models in offices, branches, and labs.
- Check Cisco’s advisory for fixed software, workarounds, or product lifecycle guidance.
- Limit management interface access to trusted administrative networks only.
- Review and rotate router administrator credentials where compromise is plausible.
- Replace unsupported devices if vendor-supported remediation is unavailable.
Validation and detection
- Confirm router model and firmware against Cisco’s affected-product guidance.
- Verify management interfaces are not exposed to untrusted networks.
- Audit administrator accounts for shared, stale, or unexpected credentials.
- Review logs for unusual management access or unexpected reload events.
- Document remediation status for each affected router.
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-2021-1334 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.
