CVE-2021-21186: Insufficient policy enforcement in QR scanning

Reference Links

• https://security-tracker.debian.org/tracker/CVE-2021-21186
• https://chromereleases.googleblog.com/2021/03/stable-channel-update-for-desktop.html (Advisory)
• https://crbug.com/1153445
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BBT54RKAE5XLMWSHLVUKJ7T2XHHYMXLH/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FE5SIKEVYTMDCC5OSXGOM2KRPYLHYMQX/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LCIDZ77XUDMB2EBPPWCQXPEIJERDNSNT/
• https://security.gentoo.org/glsa/202104-08
• https://www.debian.org/security/2021/dsa-4886
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FE5SIKEVYTMDCC5OSXGOM2KRPYLHYMQX/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBT54RKAE5XLMWSHLVUKJ7T2XHHYMXLH/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCIDZ77XUDMB2EBPPWCQXPEIJERDNSNT/

Parent vulnerabilities

(Appears in the following advisories)

• 3803715665928870837

Peer vulnerabilities

(Found alongside the following vulnerabilities)

• CVE-2021-21159
• CVE-2021-21160
• CVE-2021-21161
• CVE-2021-21162
• CVE-2021-21163
• CVE-2021-21164
• CVE-2021-21165
• CVE-2021-21166
• CVE-2021-21167
• CVE-2021-21168
• CVE-2021-21169
• CVE-2021-21170
• CVE-2021-21171
• CVE-2021-21172
• CVE-2021-21173
• CVE-2021-21174
• CVE-2021-21175
• CVE-2021-21176
• CVE-2021-21177
• CVE-2021-21178
• CVE-2021-21179
• CVE-2021-21180
• CVE-2020-27844
• CVE-2021-21181
• CVE-2021-21182
• CVE-2021-21183
• CVE-2021-21184
• CVE-2021-21185
• CVE-2021-21187
• CVE-2021-21188
• CVE-2021-21189
• CVE-2021-21190
• CVE-2021-21200

Frequently Asked Questions

• What is the severity of CVE-2021-21186?

  CVE-2021-21186 has been classified as a moderate severity vulnerability due to insufficient policy enforcement in QR scanning.

• How do I fix CVE-2021-21186?

  To fix CVE-2021-21186, users should update Google Chrome to version 89.0.4389.72 or later.

• What platforms are affected by CVE-2021-21186?

  CVE-2021-21186 affects Google Chrome on iOS and various versions of Chromium on Debian and Fedora.

• What type of vulnerability is CVE-2021-21186?

  CVE-2021-21186 is an insufficient policy enforcement vulnerability that allows bypassing navigation restrictions.

• Can scanning a QR code lead to exploitation of CVE-2021-21186?

  Yes, an attacker could exploit CVE-2021-21186 by convincing a user to scan a crafted QR code.