-----BEGIN PGP SIGNED MESSAGE-----
AUSCERT External Security Bulletin Redistribution
Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers Remote
Command Execution and Denial of Service Vulnerability
19 August 2021
AusCERT Security Bulletin Summary
Product: Small Business RV series routers
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2021-34730
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers Remote Command
Execution and Denial of Service Vulnerability
Advisory ID: cisco-sa-cisco-sb-rv-overflow-htpymMB5
First Published: 2021 August 18 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvz05607
CVE Names: CVE-2021-34730
o A vulnerability in the Universal Plug-and-Play (UPnP) service of Cisco
Small Business RV110W, RV130, RV130W, and RV215W Routers could allow an
unauthenticated, remote attacker to execute arbitrary code or cause an
affected device to restart unexpectedly, resulting in a denial of service
This vulnerability is due to improper validation of incoming UPnP traffic.
An attacker could exploit this vulnerability by sending a crafted UPnP
request to an affected device. A successful exploit could allow the
attacker to execute arbitrary code as the root user on the underlying
operating system or cause the device to reload, resulting in a DoS
Cisco has not released software updates that address this vulnerability.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
o Vulnerable Products
This vulnerability affects the following Cisco Small Business RV Series
Routers if they have UPnP configured:
RV110W Wireless-N VPN Firewalls
RV130 VPN Routers
RV130W Wireless-N Multifunction VPN Routers
RV215W Wireless-N VPN Routers
Note: The UPnP service is enabled by default on LAN interfaces and disabled
by default on WAN interfaces. If UPnP is disabled on both the LAN and WAN
interfaces, the device is not considered vulnerable.
Determine the UPnP Configuration
To determine whether the UPnP feature is enabled on the LAN interface of a
device, open the web-based management interface and navigate to Basic
Settings > UPnP . If the Disable check box is unchecked, UPnP is enabled on
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
o There are no workarounds that address this vulnerability. However,
administrators may disable the affected feature.
To disable UPnP on the LAN interface of a device, do the following:
1. Open the web-based management interface and choose Basic Settings >
2. Check the Disable check box.
While this mitigation has been deployed and was proven successful in a test
environment, customers should determine the applicability and effectiveness
in their own environment and under their own use conditions. Customers
should be aware that any workaround or mitigation that is implemented may
negatively impact the functionality or performance of their network based
on intrinsic customer deployment scenarios and limitations. Customers
should not deploy any workarounds or mitigations before first evaluating
the applicability to their own environment and any impact to such
o Cisco has not released and will not release software updates to address the
vulnerability described in this advisory. The Cisco Small Business RV110W,
RV130, RV130W, and RV215W Routers have entered the end-of-life process.
Customers are advised to refer to the end-of-life notices for these
End-of-Sale and End-of-Life Announcement for the Cisco Small Business RV
Series Routers (selected models)
Customers are encouraged to migrate to the Cisco Small Business RV132W,
RV160, or RV160W Routers.
When considering a device migration, 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 new devices will be sufficient
for their network needs; the new devices contain sufficient memory, and
current hardware and software configurations will continue to be supported
properly by the new product. If the information is not clear, customers are
advised to contact the Cisco Technical Assistance Center (TAC) or their
contracted maintenance providers.
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 vulnerability that is
described in this advisory.
o Cisco would like to thank Quentin Kaiser of IoT Inspector Research Lab for
reporting this vulnerability.
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-AUG-18 |
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to firstname.lastname@example.org
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
Australian Computer Emergency Response Team
The University of Queensland
Internet Email: email@example.com
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
-----BEGIN PGP SIGNATURE-----
-----END PGP SIGNATURE-----