Security readout for executives and security teams
Plain-English summary
Affected Cisco Small Business RV-series routers have management-interface flaws that can let an administrator-level attacker run code as root or crash the device. Cisco has not released software updates for this issue, so exposure should be treated as an operational risk requiring inventory, access control, and vendor-guidance review.
Executive priority
Prioritize this for any affected router reachable beyond a tightly controlled admin network. The combination of root-level impact, denial of service risk, and no available Cisco software update makes continued use a business continuity and perimeter-security concern.
Technical view
CVE-2021-1187 covers multiple input-validation vulnerabilities in the web-based management interface of Cisco RV110W, RV130, RV130W, and RV215W routers. Crafted HTTP requests by an authenticated remote administrator can trigger arbitrary code execution as root or device reload. CVSS 3.1 is 7.2, with high privileges required.
Likely exposure
Exposure is likely where these Cisco Small Business router models are still deployed and their web management interface is reachable by remote administrators. Risk rises if admin credentials are shared, weak, reused, or if management access is broadly reachable from untrusted networks.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires valid administrator credentials and access to the management interface. Successful exploitation could compromise the router at root level or cause denial of service through unexpected reloads.
Researcher notes
Evidence is limited to the CVE record and Cisco advisory metadata in the provided bundle. The key constraint is PR:H: exploitation requires administrator credentials. Do not assume unauthenticated exploitation, public exploit availability, or a vendor patch from these sources.
Mitigation direction
- Identify affected RV110W, RV130, RV130W, and RV215W deployments.
- Review Cisco advisory for current product-specific guidance.
- Restrict management interface access to trusted administrative networks only.
- Harden administrator credentials and remove unnecessary admin accounts.
- Consider replacement or retirement where no vendor update is available.
Validation and detection
- Inventory network edge devices for affected Cisco Small Business RV models.
- Confirm whether web management is reachable from untrusted networks.
- Review administrative account list for unnecessary or shared credentials.
- Check logs for unexpected reloads or suspicious management activity.
- Document compensating controls if devices cannot be replaced promptly.
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-2021-1187 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
- 20210113 Cisco Small Business RV110W, RV130, RV130W, and RV215W 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.