CVE-2021-20843 Cross-site scripting in RTX830, NVR510, NVR700W, RTX1210
Remote authenticated attackers can inject scripts into the Web GUI to alter device settings on Yamaha routers and NVRs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-20843?
CVE-2021-20843 is a medium-severity cross-site scripting vulnerability in Yamaha Corporation RTX830, NVR510, NVR700W, RTX1210, published on 24 Nov 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Cross-site script inclusion vulnerability in the Web GUI of RTX830 Rev.15.02.17 and earlier, NVR510 Rev.15.01.18 and earlier, NVR700W Rev.15.00.19 and earlier, and RTX1210 Rev.14.01.38 and earlier allows a remote authenticated attacker to alter the settings of the product via a specially crafted web page.
Weakness: CWE-829
Which versions are affected by CVE-2021-20843?
It affects 8 products.
Products include Ntt-West Biz Box Nvr510 Firmware, Ntt-West Biz Box Nvr700w Firmware, Ntt-West Biz Box Rtx1210 Firmware, Ntt-West Biz Box Rtx830 Firmware, Yamaha Nvr510 Firmware, Yamaha Nvr700w Firmware and 2 more.
How do I fix CVE-2021-20843?
No fix has been published for CVE-2021-20843 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2021-20843 being exploited?
There is no known exploitation of CVE-2021-20843 in the wild and no public exploit code.
Other vulnerabilities in Yamaha Corporation RTX830, NVR510, NVR700W, RTX1210
Sources
Also known as GHSA-pf3w-79fm-4mjf.