Buffer overflow in Cisco Application Extension Platform
CVE-2021-34730
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 (DoS) condition. 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 condition. Cisco has not released software updates that address this vulnerability.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.185 (97.2th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.185 · newest: 0.185 · change: 0.000
Affected products
- Cisco Application Extension Platform — versions 1.0.3.55
- Cisco Small Business Rv Series Router Firmware
- Cisco Rv110w Wireless-N Vpn Firewall
- Cisco Rv110w Wireless-N Vpn Firewall Firmware
- Cisco Rv130 Vpn Router
- Cisco Rv130 Vpn Router Firmware
- Cisco Rv130w Wireless-N Multifunction Vpn Router
- Cisco Rv130w Wireless-N Multifunction Vpn Router Firmware
- Cisco Rv215w Wireless-N Vpn Router
- Cisco Rv215w Wireless-N Vpn Router Firmware
Weakness classification (CWE)
Public proof-of-concept exploits
References
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cisco-sb… (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-34730?
- CVE-2021-34730 is a critical-severity vulnerability in Cisco Application Extension Platform, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2021-08-18.
- How severe is CVE-2021-34730?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-34730 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.