CVE-2021-21123: Insufficient data validation in File System API

Reference Links

• https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_19.html (Advisory)
• https://crbug.com/1137247
• https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21123

Parent vulnerabilities

(Appears in the following advisories)

• 8963246051762193641

Peer vulnerabilities

(Found alongside the following vulnerabilities)

• CVE-2021-21117
• CVE-2021-21118
• CVE-2021-21119
• CVE-2021-21120
• CVE-2021-21121
• CVE-2021-21122
• CVE-2021-21124
• CVE-2021-21125
• CVE-2020-16044
• CVE-2021-21126
• CVE-2021-21127
• CVE-2021-21128
• CVE-2021-21129
• CVE-2021-21130
• CVE-2021-21131
• CVE-2021-21132
• CVE-2021-21133
• CVE-2021-21134
• CVE-2021-21135
• CVE-2021-21136
• CVE-2021-21137
• CVE-2021-21138
• CVE-2021-21139
• CVE-2021-21140
• CVE-2021-21141

Frequently Asked Questions

• What is the severity of CVE-2021-21123?

  CVE-2021-21123 is rated as a high severity vulnerability due to its potential to allow remote attackers to bypass filesystem restrictions.

• How do I fix CVE-2021-21123?

  To fix CVE-2021-21123, update Google Chrome to version 88.0.4324.96 or later.

• What versions of Google Chrome are affected by CVE-2021-21123?

  CVE-2021-21123 affects Google Chrome versions prior to 88.0.4324.96.

• Is Microsoft Edge Chromium also affected by CVE-2021-21123?

  Yes, Microsoft Edge Chromium versions prior to 88.0.705.50 are also affected by CVE-2021-21123.

• What type of attack does CVE-2021-21123 enable?

  CVE-2021-21123 enables remote attackers to exploit insufficient data validation vulnerabilities via a crafted HTML page.