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MEDIUM

CVE-2021-1801

CVSS v3

6.5

MEDIUM

EPSS Score

1.5 %

exploit probability, as of 2026-10-18

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • accountsserviceAlmaLinux:8all versions · fixed in 0.6.55-2.el8and 2 other packages
  • gdmAlmaLinux:8all versions · fixed in 1:40.0-15.el8
  • gnome-autoarAlmaLinux:8all versions · fixed in 0.2.3-2.el8
  • gnome-calculatorAlmaLinux:8all versions · fixed in 3.28.2-2.el8
  • gnome-classic-sessionAlmaLinux:8all versions · fixed in 3.32.1-20.el8and 23 other packages
  • gnome-control-centerAlmaLinux:8all versions · fixed in 3.28.2-28.el8and 1 other package
  • gnome-online-accountsAlmaLinux:8all versions · fixed in 3.28.2-3.el8and 1 other package
  • gnome-sessionAlmaLinux:8all versions · fixed in 3.28.1-13.el8and 3 other packages

9 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-1801 Red Hat Product Security70 products fixed · 9 known affected

    webkitgtk: IFrame sandboxing policy violation

    webkitgtk as a component of Red Hat Enterprise Linux 6 · webkitgtk-devel as a component of Red Hat Enterprise Linux 6 · webkitgtk-doc as a component of Red Hat Enterprise Linux 6

  • RHSA-2025:10364 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: webkitgtk4 security update

  • RHSA-2021:4381 Red Hat Product Security46 products fixed

    Red Hat Security Advisory: GNOME security, bug fix, and enhancement update

Full record on NVD

Description

This issue was addressed with improved iframe sandbox enforcement. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. Maliciously crafted web content may violate iframe sandboxing policy.

Technical details

Published
2021-04-02

Frequently asked questions

What is CVE-2021-1801?

This issue was addressed with improved iframe sandbox enforcement. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. Maliciously crafted web content may violate iframe sandboxing policy.

Is CVE-2021-1801 actively exploited?

Active exploitation of CVE-2021-1801 has not been confirmed. Its EPSS score was 1.5% on 2026-10-18, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-1801?

CVE-2021-1801 has a CVSS v3 base score of 6.5 (MEDIUM severity).

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