CVE-2021-20728

Name: CVE-2021-20728
Creator: NVD / NIST
Published: 2021-06-09T02:15:06.707+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.99%

Last modified Jun 17, 2026

CVE-2021-20728 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Improper access control vulnerability in goo blog App for Android ver.1.2.25 and earlier and for iOS ver.1.3.3 and earlier allows a remote attacker to lead a user to access an arbitrary website via the vulnerable App.. EPSS estimates a 0.99% chance of exploitation in the next 30 days.

Description

Improper access control vulnerability in goo blog App for Android ver.1.2.25 and earlier and for iOS ver.1.3.3 and earlier allows a remote attacker to lead a user to access an arbitrary website via the vulnerable App.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.99%

58.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Nttr	Goo Blog	<= 1.2.25
Nttr	Goo Blog	<= 1.3.3

References

https://blog.goo.ne.jp/staffblog/e/d84a6b220222462094728301782885dbVendor Advisory
https://jvn.jp/en/jp/JVN91691168/index.htmlThird Party Advisory
https://blog.goo.ne.jp/staffblog/e/d84a6b220222462094728301782885dbVendor Advisory
https://jvn.jp/en/jp/JVN91691168/index.htmlThird Party Advisory

Timeline

Published: Jun 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20728?

How severe is CVE-2021-20728?

CVE-2021-20728 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.99% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20728?

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-2021-20728?

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

Scan your code now

Source: NVD / NIST