CVE-2021-20137 Cross-site scripting in Gryphon Tower router
Reflected XSS in Gryphon Tower router allows attackers to execute JavaScript in victim browsers via crafted links.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-20137?
CVE-2021-20137 is a medium-severity cross-site scripting vulnerability in Gryphon Tower router, published on 9 Dec 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A reflected cross-site scripting vulnerability exists in the url parameter of the /cgi-bin/luci/site_access/ page on the Gryphon Tower router's web interface. An attacker could exploit this issue by tricking a user into following a specially crafted link, granting the attacker javascript execution in the context of the victim's browser.
Weakness: CWE-79
Which versions are affected by CVE-2021-20137?
It affects 1 product.
Products include Gryphonconnect Gryphon Tower Firmware.
How do I fix CVE-2021-20137?
No fix has been published for CVE-2021-20137 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-2021-20137 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-20137 exists.
Public exploit code: 1 Nuclei template.
Other vulnerabilities in Gryphon Tower router
Sources
Also known as GHSA-3m6f-2h66-fxv5.