What is CVE-2021-20137?

CVE-2021-20137 is a medium-severity vulnerability in Gryphonconnect Gryphon Tower, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-12-09.

How severe is CVE-2021-20137?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-20137 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Gryphonconnect Gryphon Tower

CVE-2021-20137

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.026 (83.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Gryphonconnect Gryphon_tower
Gryphonconnect Gryphon_tower_firmware
N/a Gryphon Tower Router — versions <= 04.0004.12 (Current)

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

vulnreport@tenable.com (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-20137?: CVE-2021-20137 is a medium-severity vulnerability in Gryphonconnect Gryphon Tower, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-12-09.
How severe is CVE-2021-20137?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-20137 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.