Security readout for executives and security teams
Plain-English summary
CVE-2021-1181 affects older Cisco Small Business RV110W, RV130, RV130W, and RV215W routers. An attacker with valid administrator credentials could abuse the web management interface to run code as root or force a restart. Cisco says it has not released software updates for these vulnerabilities.
Executive priority
Treat this as a high-priority legacy device risk. The exploit requires administrator access, but successful compromise gives root-level control or outage potential, and the cited Cisco advisory says no software updates were released. Prioritize exposure reduction, credential control, and replacement planning.
Technical view
The issue is improper validation of user-supplied input in the routers' web-based management interface. Crafted HTTP requests from an authenticated remote administrator can trigger arbitrary code execution on the underlying OS as root or denial of service through device reload. CVSS v3.1 score is 7.2, high, with high privileges required.
Likely exposure
Exposure is most likely where these Cisco Small Business RV models remain deployed and the management interface is reachable by administrators over a network. Risk increases if admin credentials are shared, weak, reused, or if management access is exposed beyond trusted networks. The bundle does not provide affected firmware version granularity.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation evidence. Exploitation requires valid administrator credentials, which lowers broad internet risk but keeps impact serious after credential compromise or insider misuse.
Researcher notes
Focus validation on asset presence, management-plane reachability, credential governance, and signs of authenticated abuse. Do not assume uncredentialed exploitation from the provided evidence. The source bundle names CWE-121 and CVSS AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Mitigation direction
- Check Cisco advisory and lifecycle guidance for supported remediation options.
- Restrict web management access to trusted admin networks or VPN only.
- Review, rotate, and strengthen router administrator credentials.
- Remove or replace affected routers if no vendor fix is available.
- Monitor for unexpected reloads or suspicious management activity.
Validation and detection
- Inventory Cisco RV110W, RV130, RV130W, and RV215W devices.
- Confirm whether the web management interface is reachable remotely.
- Review administrator accounts for weak, shared, or stale credentials.
- Check logs for unusual admin sessions, HTTP requests, or device reloads.
- Verify current vendor guidance because Cisco reported no software updates.
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-2021-1181 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.