Security readout for executives and security teams
Plain-English summary
This flaw lets an attacker who already has administrator access to the router’s web management interface crash the device or run code as root. It affects several Cisco Small Business RV router families. Business urgency is highest where these routers are still deployed and their management interface is reachable beyond tightly controlled admin networks.
Executive priority
Prioritize remediation for any affected router that protects business connectivity or has remotely reachable management. The attacker needs admin access, but successful exploitation can produce root-level control or outages on network edge equipment. Address through firmware review, access restriction, and admin credential governance.
Technical view
CVE-2020-3294 covers multiple stack overflow flaws in web management scripts for Cisco RV320, RV325, RV016, RV042, and RV082 routers. Crafted requests with oversized values can trigger memory corruption. Exploitation requires remote network access and high privileges: an authenticated administrator session. Successful exploitation may cause denial of service or root-level code execution.
Likely exposure
Exposure is limited to affected Cisco Small Business RV routers where an attacker can authenticate to the web management interface as an administrator. Risk increases if management access is broadly reachable or administrator credentials are weak, shared, or compromised. The supplied bundle does not include exact vulnerable or fixed firmware versions.
Exploitation context
The CVSS vector is network-accessible, low complexity, no user interaction, but high privileges required. The source bundle does not show CISA KEV listing or active exploitation evidence. Treat this as a serious post-authentication device compromise risk, not confirmed in-the-wild exploitation.
Researcher notes
The supplied evidence identifies the bug class, affected router families, privilege requirement, and impact. It does not include fixed firmware ranges, proof-of-concept details, or active exploitation confirmation. Validation should focus on asset presence, firmware status against Cisco guidance, and management-plane exposure rather than exploit testing.
Mitigation direction
- Check Cisco’s advisory for affected and fixed firmware guidance.
- Upgrade affected routers according to Cisco’s official instructions.
- Restrict web management access to trusted administrative networks only.
- Disable remote management exposure where operationally unnecessary.
- Review and tighten administrator account access controls.
Validation and detection
- Inventory RV320, RV325, RV016, RV042, and RV082 devices.
- Record firmware versions and compare them with Cisco’s advisory.
- Confirm management interfaces are not publicly reachable.
- Review administrator accounts for unnecessary or shared access.
- Check logs for unexpected administrative access or device crashes.
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
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CWE-119: 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-2020-3294 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.2 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/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:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H1.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.2HighVector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200617 Cisco Small Business RV Series Routers Stack Overflow Arbitrary 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.