CVE-2021-20783

Name: CVE-2021-20783
Creator: NVD / NIST
Published: 2021-07-30T14:15:14.753+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.55%

Last modified Jun 17, 2026

CVE-2021-20783 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Cross-site request forgery (CSRF) vulnerability in Optical BB unit E-WMTA2.3 allows a remote attacker to hijack the authentication of administrators via a specially crafted page.. EPSS estimates a 0.55% chance of exploitation in the next 30 days.

Description

Cross-site request forgery (CSRF) vulnerability in Optical BB unit E-WMTA2.3 allows a remote attacker to hijack the authentication of administrators via a specially crafted page.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.55%

41.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Softbank	Optical Bb Unit E-Wmta Firmware	2.3

References

https://jvn.jp/en/jp/JVN34364599/index.htmlThird Party Advisory
https://jvn.jp/en/jp/JVN34364599/index.htmlThird Party Advisory

Timeline

Published: Jul 30, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20783?

Cross-site request forgery (CSRF) vulnerability in Optical BB unit E-WMTA2.3 allows a remote attacker to hijack the authentication of administrators via a specially crafted page.

How severe is CVE-2021-20783?

CVE-2021-20783 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.55% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20783?

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-2021-20783?

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

Scan your code now

Source: NVD / NIST