Security readout for executives and security teams
Plain-English summary
This flaw gives a remote unauthenticated attacker a path to fully control an affected Cisco RV110W router through Telnet because a built-in system account uses a static default password. For executives, the business risk is loss of control over edge network equipment, not just a normal software bug.
Executive priority
Treat this as urgent for any remaining RV110W deployment, especially at branch or perimeter locations. Prioritize asset confirmation first, then vendor-guided remediation or replacement. Lack of KEV evidence lowers certainty about active exploitation, not the impact if exposed.
Technical view
CVE-2020-3330 is a CWE-798 static credential issue in the Telnet service of Cisco Small Business RV110W Wireless-N VPN Firewall firmware. Cisco describes unauthenticated remote access to a high-privileged account, with successful exploitation allowing full device control. CVSS v3.0 is 9.8, network exploitable, low complexity, no privileges, and no user interaction.
Likely exposure
Exposure is most relevant where Cisco RV110W devices have Telnet reachable from untrusted networks or poorly restricted management networks. The source bundle identifies RV110W firmware but does not provide affected version ranges or asset-discovery indicators.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The issue is still high urgency because the described attack requires no authentication and can yield full control of an affected network edge device.
Researcher notes
The provided evidence is strong on impact and root cause but incomplete on affected firmware versions and concrete fixes. Do not generalize this CVE to other Cisco Small Business routers without separate evidence. Validate exposure through inventory and management-plane reachability, not product-family assumptions.
Mitigation direction
- Inventory environments for Cisco RV110W Wireless-N VPN Firewall devices.
- Review Cisco’s advisory for official fixed firmware or mitigation guidance.
- Remove Telnet management exposure from untrusted networks pending vendor guidance.
- Restrict router management access to trusted administrative networks only.
- Replace affected devices if no vendor-supported fix is available.
Validation and detection
- Confirm whether any RV110W devices remain deployed or internet reachable.
- Check router firmware and management service configuration against Cisco guidance.
- Verify Telnet is not exposed to untrusted networks.
- Review device logs for unexpected administrative access or configuration changes.
- Track remediation evidence in vulnerability management records.
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-798: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-3330 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 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
9.8CriticalVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200715 Cisco Small Business RV110W Wireless-N VPN Firewall Static Default Credential VulnerabilityCVE 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.
Use of Hard-coded Credentials
Use of Hard-coded Credentials represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.