Buffer overflow in Realtek Rtl819x Jungle Software Development Kit
CVE-2021-35393
Realtek Jungle SDK version v2.x up to v3.4.14B provides a 'WiFi Simple Config' server that implements both UPnP and SSDP protocols. The binary is usually named wscd or mini_upnpd and is the successor to miniigd. The server is vulnerable to a stack buffer overflow vulnerability that is present due to unsafe parsing of the UPnP SUBSCRIBE/UNSUBSCRIBE Callback header. Successful exploitation of this vulnerability allows remote unauthenticated attackers to gain arbitrary code execution on the affected device.
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: 0.664 (99.3th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.703 · newest: 0.664 · change: -0.039
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.realtek.com/en/cu-1-en/cu-1-taiwan-en (Patch, Broken Link, Vendor Advisory)
- www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392… (Patch, Vendor Advisory)
- www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain (Exploit, Third Party Advisory, Broken Link)
Frequently asked questions
- What is CVE-2021-35393?
- CVE-2021-35393 is a critical-severity vulnerability in Realtek Rtl819x Jungle Software Development Kit, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-08-16.
- How severe is CVE-2021-35393?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-35393 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.