CVE-2021-1473
Published: April 11, 2026
Official Description
Multiple vulnerabilities exist in the web-based management interface of Cisco Small Business RV Series Routers. A remote attacker could execute arbitrary commands or bypass authentication and upload files on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.
Risk Analysis
This vulnerability affects the web-based management interface of Cisco Small Business RV Series Routers, allowing a remote attacker to execute arbitrary commands or bypass authentication and upload files. This could lead to full device compromise. The CISA KEV catalog confirms this vulnerability has been actively exploited, making it a critical threat.
This vulnerability has been actively exploited in the wild. It is remotely exploitable through the web-based management interface of affected Cisco routers.
Consult Cisco's advisory for specific patch and upgrade guidance for your Cisco Small Business RV Series Router. Ensure that management interfaces are not exposed to untrusted networks.
Technical Analysis
CVE-2021-1473 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2021-1473 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-1473 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1