CVE-2021-3731 Improper Restriction of Rendered UI Layers or Frames in ledgersmb/ledgersmb

What is CVE-2021-3731?

CVE-2021-3731 is a medium-severity vulnerability in Debian Debian Linux, published on 23 Aug 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

LedgerSMB does not sufficiently guard against being wrapped by other sites, making it vulnerable to 'clickjacking'. This allows an attacker to trick a targetted user to execute unintended actions.

Weakness: CWE-1021

Which versions are affected by CVE-2021-3731?

It affects 2 products.

Products include Debian Debian Linux, Ledgersmb Ledgersmb.

How do I fix CVE-2021-3731?

Apply the vendor's patch.

Is CVE-2021-3731 being exploited?

There is no known exploitation of CVE-2021-3731 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

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• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-3731, GHSA-vj43-qmpm-3qqp, UBUNTU-CVE-2021-3731.