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AUSCERT External Security Bulletin Redistribution
Cisco Small Business RV160, RV160W, RV260, RV260P, and
RV260W VPN Routers Arbitrary File Write Vulnerabilities
4 February 2021
AusCERT Security Bulletin Summary
Product: Cisco Small Business Routers
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Overwrite Arbitrary Files -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2021-1297 CVE-2021-1296
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Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers
Arbitrary File Write Vulnerabilities
Advisory ID: cisco-sa-rv160-260-filewrite-7x9mnKjn
First Published: 2021 February 3 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvw19856 CSCvw22856
CVE Names: CVE-2021-1296 CVE-2021-1297
o 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
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.
Cisco has released software updates that address these vulnerabilities.
There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
o Vulnerable Products
These vulnerabilities affect the following Cisco Small Business Routers if
they are running a firmware release earlier than Release 1.0.01.02:
RV160 VPN Router
RV160W Wireless-AC VPN Router
RV260 VPN Router
RV260P VPN Router with POE
RV260W Wireless-AC VPN Router
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by these vulnerabilities.
Cisco has confirmed that these vulnerabilities do not affect the following
RV340 Dual WAN Gigabit VPN Router
RV340W Dual WAN Gigabit Wireless-AC VPN Router
RV345 Dual WAN Gigabit VPN Router
RV345P Dual WAN Gigabit POE VPN Router
o There are no workarounds that address these vulnerabilities.
o Cisco has released free software updates that address the vulnerabilities
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
Cisco fixed these vulnerabilities in firmware releases 1.0.01.02 and later
for Cisco RV160, RV160W, RV260, RV260P, and RV260W Routers.
To download the software from the Software Center on Cisco.com, do the
1. Click Browse all .
2. Choose Routers > Small Business Routers > Small Business RV Series
3. Choose the appropriate router.
4. Choose Small Business Router Firmware .
5. Choose a release from the left pane of the product page.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerabilities that are
described in this advisory.
o Cisco would like to thank T. Shiomitsu working with Trend Micro Zero Day
Initiative for reporting these vulnerabilities.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
| Version | Description | Section | Status | Date |
| 1.0 | Initial public release. | - | Final | 2021-FEB-03 |
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