CVE intelligence and bounded remediation

CVE-2021-1315 — Cisco Rv016 Multi-Wan Vpn Router Firmware security vulnerability

High CVSS 9

Multiple vulnerabilities in the web-based management interface of Cisco Small Business RV016, RV042, RV042G, RV082, RV320, and RV325 Routers could allow an authenticated, remote attacker to inject arbitrary commands that are executed with root privileges. These vulnerabilities are due to improper validation of user-supplied input in the web-based management interface. An attacker could exploit these vulnerabilities by sending crafted HTTP requests to a targeted device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system. To exploit these vulnerabilities, an attacker would need to have valid administrator credentials on an affected device.

Severity
High
CVSS
9 (2.0)
Published
2021-02-04
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-20, CWE-78

Affected products

  • cisco / rv016_multi-wan_vpn_router_firmware
  • cisco / rv042_dual_wan_vpn_router_firmware
  • cisco / rv042g_dual_gigabit_wan_vpn_router_firmware
  • cisco / rv082_dual_wan_vpn_router_firmware
  • cisco / rv320_dual_gigabit_wan_vpn_router_firmware
  • cisco / rv325_dual_gigabit_wan_vpn_router_firmware

Matched remediation archetype

Command, code, expression, and template injection

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Check exposure

  • Trace untrusted values to process execution, interpreters, evaluators, template engines, dynamic imports, and administrative scripting features.
  • Determine whether the affected path is reachable across each trust boundary and which service account or host privilege it inherits.
  • Review configuration for optional execution features, unsafe compatibility modes, and shell invocation.

Remediate safely

  • Replace string-built commands or evaluated code with fixed operations and structured argument APIs that do not invoke a shell.
  • Use strict allowlists for operation identifiers and reject unexpected input before it reaches any interpreter.
  • Update the affected component and add inert regression tests covering metacharacters, encoding variants, and alternate request paths.

Authoritative sources

Complete CVE record and remediation plan

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