Security readout for executives and security teams
Plain-English summary
This flaw affects Cisco Small Business RV340, RV340W, RV345, and RV345P routers when SSL VPN is exposed. An unauthenticated remote attacker could potentially take control of the device or force it to reload. For leaders, the concern is business interruption and compromise at the network edge.
Executive priority
Treat as urgent for any exposed affected router. The impact includes possible network-edge compromise and outage, and exploitation requires no authentication according to the source description.
Technical view
CVE-2020-3357 is an improper input validation issue in the SSL VPN HTTP request handling of listed Cisco RV Series routers. Cisco describes possible unauthenticated remote code execution or denial of service over an SSL connection. CVSS 3.1 is 9.8, with network attack vector, low complexity, and no privileges or user interaction required.
Likely exposure
Exposure is most likely where affected Cisco RV340, RV340W, RV345, or RV345P routers have SSL VPN enabled and reachable from the internet or untrusted networks. The bundle does not provide affected firmware ranges.
Exploitation context
The provided sources describe remote unauthenticated exploitation potential, but do not state confirmed active exploitation. The CVE is not marked as CISA KEV in the bundle, so active exploitation should not be assumed from this evidence alone.
Researcher notes
Evidence is strong on vulnerability class, impact, attack vector, and affected models, but incomplete on exact firmware versions and remediation details in the supplied bundle. Validate against the Cisco advisory before declaring exposure or closure.
Mitigation direction
- Review Cisco advisory for fixed firmware, workarounds, and affected release details.
- Prioritize remediation for internet-exposed SSL VPN interfaces on listed RV models.
- Reduce SSL VPN reachability until vendor-approved remediation is applied, where operationally feasible.
- Monitor Cisco guidance for supported upgrade or replacement paths.
Validation and detection
- Inventory Cisco RV340, RV340W, RV345, and RV345P routers in use.
- Confirm whether SSL VPN is enabled and reachable from untrusted networks.
- Compare device firmware and configuration against Cisco advisory guidance.
- Review logs and uptime for unexpected reloads or suspicious remote access activity.
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-20: Exact CWE lookup
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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-2020-3357 mapping review
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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
- 20200715 Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers SSL Remote Code Execution and Denial of Service 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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.