Security readout for executives and security teams
Plain-English summary
This is a critical router flaw that can let an unauthenticated attacker run code as root through the web management interface. Compromise of these VPN routers can affect confidentiality, integrity, and availability of network traffic and edge access.
Executive priority
High priority for networks using these routers. A successful attack could give root-level control of an edge VPN device, creating business risk around remote access, traffic interception, outages, and broader network compromise.
Technical view
Cisco describes improper validation of HTTP requests in the web-based management interface of RV160, RV160W, RV260, RV260P, and RV260W VPN routers. A crafted request could allow remote arbitrary code execution as root. CVSS is 9.8 with network access, low complexity, no privileges, and no user interaction.
Likely exposure
Organizations using the listed Cisco Small Business RV160/RV260 family VPN routers are in scope, especially if the web-based management interface is reachable from untrusted networks. The source bundle does not provide affected firmware version ranges.
Exploitation context
The supplied sources do not state active exploitation, and the CVE is not marked KEV. The exploit path is remote unauthenticated HTTP interaction with the management interface, but no weaponized details are needed to assess urgency.
Researcher notes
Evidence is strong for impact and attack surface, but incomplete for affected firmware versions, patch availability, and observed exploitation. Use Cisco’s advisory as the authoritative source before making version-specific claims or closure decisions.
Mitigation direction
- Inventory Cisco RV160, RV160W, RV260, RV260P, and RV260W routers.
- Check Cisco’s advisory for fixed firmware and exact affected versions.
- Prioritize remediation for any internet-reachable management interfaces.
- Restrict management access to trusted administrative networks where possible.
- Monitor Cisco guidance for model-specific upgrade or workaround instructions.
Validation and detection
- Confirm whether any listed router models are deployed.
- Record current firmware versions for each affected model.
- Verify management interface exposure from internal and external network paths.
- Review device logs for unusual management-interface activity.
- Confirm remediation status against Cisco’s advisory.
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-472: 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-2021-1289 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20210203 Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers Remote Code Execution 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.
External Control of Assumed-Immutable Web Parameter
External Control of Assumed-Immutable Web Parameter represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.