Security readout for executives and security teams
Plain-English summary
This CVE affects several Cisco Small Business RV routers. An attacker who already has administrator access to the web management interface could crash the router or run code with root privileges. The admin-access requirement reduces likelihood, but compromise of a perimeter or branch router can still create serious business risk.
Executive priority
Treat as high priority where affected routers are still deployed. The vulnerability needs admin access, but routers often sit at sensitive network positions, and successful exploitation could disrupt service or give root-level control of the device.
Technical view
The issue is a stack overflow in web-based management scripts caused by insufficient boundary restrictions on user-supplied input. Cisco lists RV320, RV325, RV016, RV042, and RV082 routers. Exploitation requires authenticated remote administrative access and can lead to denial of service or arbitrary code execution as root.
Likely exposure
Exposure is likely limited to organizations still operating the named Cisco Small Business RV router models. Risk is higher where the management interface is reachable over a network path available to administrators or compromised admin credentials.
Exploitation context
The provided sources do not cite active exploitation, and the CVE is not marked as CISA KEV. Exploitation requires administrative privileges, but the impact after successful exploitation is severe because code may run as root.
Researcher notes
CVSS 3.0 score is 7.2 with AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. The source bundle does not provide exact affected firmware ranges or fixed versions, so validation should be tied to Cisco’s advisory.
Mitigation direction
- Identify whether affected RV router models remain in production.
- Review Cisco advisory for fixed software, workarounds, and upgrade guidance.
- Restrict access to the web management interface to trusted administration networks.
- Rotate and review administrative credentials for affected routers.
- Prioritize replacement if vendor-supported fixes are unavailable.
Validation and detection
- Inventory RV320, RV325, RV016, RV042, and RV082 devices.
- Compare firmware and model details against Cisco’s advisory.
- Confirm management interfaces are not broadly reachable.
- Review router logs for unexpected crashes or administrative activity.
- Verify only authorized administrators can access management functions.
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-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-2020-3291 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 (3.0)
- 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.
Improper Restriction of Operations within the Bounds of a Memory Buffer
Improper Restriction of Operations within the Bounds of a Memory Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.