CVE-2021-20844 Cross-site scripting in RTX830, NVR510, NVR700W, RTX1210
A remote authenticated attacker can obtain sensitive information via a specially crafted web page due to improper neutralization of HTTP request headers in the Web GUI.
- 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-2021-20844?
CVE-2021-20844 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
Improper neutralization of HTTP request headers for scripting syntax 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 obtain sensitive information via a specially crafted web page.
Weakness: CWE-116
Which versions are affected by CVE-2021-20844?
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-2021-20844?
No fix has been published for CVE-2021-20844 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-2021-20844 being exploited?
There is no known exploitation of CVE-2021-20844 in the wild and no public exploit code.
Other vulnerabilities in Yamaha Corporation RTX830, NVR510, NVR700W, RTX1210
Sources
Also known as GHSA-gpv9-mf3p-h34x.