Security Resilience

CVE-2024-20393

Access Control in Cisco Rv340 Dual Wan Gigabit Vpn Router Firmware 1.0.00.29 … 1.0.03.29

Published
02 October 2024
Modified
08 October 2024
Patch / advisory
CVSS Score v3.1 8.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0059 47th percentile
Risk Priority 67 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2024-20393 is a high-severity Improper Authorization (CWE-285) vulnerability in Cisco Rv340 Dual Wan Gigabit Vpn Router Firmware. Its CVSS base score is 8.8 (High).

Operationally, ranked at the 47th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-24 (Access Control Decisions) and AC-25 (Reference Monitor) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

EU & UK References

Vulnerability Data

A vulnerability in the web-based management interface of Cisco Small Business RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an authenticated, remote attacker to elevate privileges on an affected device. This vulnerability exists because the web-based…

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management interface discloses sensitive information. An attacker could exploit this vulnerability by sending crafted HTTP input to an affected device. A successful exploit could allow an attacker to elevate privileges from guest to admin.

CWE(s)

Related Threats

CVEs Like This One

CVE-2024-20470Same product: Cisco Rv340 Dual Wan Gigabit Vpn Router
CVE-2025-20264Same vendor: Cisco
CVE-2023-20186Same vendor: Cisco
CVE-2024-20441Same vendor: Cisco
CVE-2024-20497Same vendor: Cisco
CVE-2024-20381Same vendor: Cisco
CVE-2024-20333Same vendor: Cisco
CVE-2026-20190Same vendor: Cisco
CVE-2023-20088Same vendor: Cisco
CVE-2025-20125Same vendor: Cisco

Affected Assets

cisco
rv340 dual wan gigabit vpn router firmware
1.0.00.29, 1.0.00.33, 1.0.01.16, 1.0.01.17, 1.0.01.18
cisco
rv340w dual wan gigabit wireless-ac vpn router firmware
1.0.00.29, 1.0.00.33, 1.0.01.16, 1.0.01.17, 1.0.01.18
cisco
rv345 dual wan gigabit vpn router firmware
1.0.00.29, 1.0.00.33, 1.0.01.16, 1.0.01.17, 1.0.01.18
cisco
rv345p dual wan gigabit poe vpn router firmware
1.0.00.29, 1.0.00.33, 1.0.01.16, 1.0.01.17, 1.0.01.18

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

Mandates that access-control decisions are made and applied to each request before access occurs.

Requires a tamperproof, always-invoked reference monitor that performs authorization checks.

Directly requires enforcement of approved authorizations for every access request, stopping improper or missing checks.

Limits granted privileges so that even a bypassed check affects fewer resources.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

blocks

A.5.1 only requires the existence of an overarching policy and topic-specific policies (including on access control); it does not itself perform or enforce any authorization check, so the CWE-285 weakness can still be exploited.

blocks

Mapping access rights to information classification and business requirements forces correct enforcement of authorization decisions, blocking the incorrect authorization weakness at the policy and implementation stage.

finds

Independent reviewers evaluate whether authorization logic matches policy, thereby reducing the window in which incorrect or missing authorization checks remain in production.

finds

By requiring managers to verify that authorization decisions match policy and to remediate deviations, the control limits the persistence of incorrect or missing authorization checks.

blocks

Requiring authorization processes and privilege assignments to be specified during project initiation prevents downstream components from receiving overly broad or incorrect rights that would allow unauthorized actions.

blocks

A.8.3 directly mandates and configures the authorization mechanisms (identity/group rights, dynamic access rules, isolation, credential enforcement) that stop CWE-285 exploitation; the bounded remainder is non-authorization exposure vectors such as error messages or observable discrepancies.

Hardening callouts derived

DISA STIG baselines are authored against specific weaknesses. Where this CVE cites a broad weakness class, the mapping is not asserted at that abstraction (owner ruling, 2026-09-25: grade only at Base and below), so no rule is shown here rather than a rule shown against the wrong grain.

  • No fine-grained STIG row for CWE-285, a class-level weakness. Rules are authored against its narrower children: CWE-552.

References