CVE-2021-37273

Name: CVE-2021-37273
Creator: NVD / NIST
Published: 2021-09-28T18:15:08.793+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.95%

Last modified Jun 17, 2026

CVE-2021-37273 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A Denial of Service issue exists in China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON ONU) 3.0. Tianyi Gateway is a hardware terminal of "Optical Modem Smart Router." Attackers can use this vulnerability to restart the device multiple times.. EPSS estimates a 0.95% chance of exploitation in the next 30 days.

Description

A Denial of Service issue exists in China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON ONU) 3.0. Tianyi Gateway is a hardware terminal of "Optical Modem Smart Router." Attackers can use this vulnerability to restart the device multiple times.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.95%

56.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Chinatelecom	Epon Tianyi Gateway Zxhn F450 Firmware	3.0

References

https://www.cnvd.org.cn/flaw/show/2958526Third Party Advisory
https://www.cnvd.org.cn/flaw/show/2958526Third Party Advisory

Timeline

Published: Sep 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-37273?

How severe is CVE-2021-37273?

CVE-2021-37273 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.95% probability of exploitation in the next 30 days.

How do I fix CVE-2021-37273?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-37273?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST