CVE-2021-1296: Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers Arbitrary File Write Vulnerabilities

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-02-04 · updated 2026-06-17
Weakness: CWE-36

Description

Multiple vulnerabilities in the web-based management interface of Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers could allow an unauthenticated, remote attacker to conduct directory traversal attacks and overwrite certain files that should be restricted on an affected system. These vulnerabilities are due to insufficient input validation. An attacker could exploit these vulnerabilities by using the web-based management interface to upload a file to location on an affected device that they should not have access to. A successful exploit could allow the attacker to overwrite files on the file system of the affected device.

Affected products

Cisco Rv160 Vpn Router Firmware: before 1.0.01.02 — fixed in 1.0.01.02
Cisco Rv160W Wireless-Ac Vpn Router Firmware: before 1.0.01.02 — fixed in 1.0.01.02
Cisco Rv260 Vpn Router Firmware: before 1.0.01.02 — fixed in 1.0.01.02
Cisco Rv260P Vpn Router With Poe Firmware: before 1.0.01.02 — fixed in 1.0.01.02
Cisco Rv260W Wireless-Ac Vpn Router Firmware: before 1.0.01.02 — fixed in 1.0.01.02

How to fix

Upgrade to a fixed version: Cisco Rv160 Vpn Router Firmware 1.0.01.02; Cisco Rv160W Wireless-Ac Vpn Router Firmware 1.0.01.02; Cisco Rv260 Vpn Router Firmware 1.0.01.02; Cisco Rv260P Vpn Router With Poe Firmware 1.0.01.02; Cisco Rv260W Wireless-Ac Vpn Router Firmware 1.0.01.02. Check the vendor advisory for mitigations.

References

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