What is CVE-2021-3731?

CVE-2021-3731 is a medium-severity vulnerability in Ledgersmb, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 5.9/10. Published 2021-08-23.

How severe is CVE-2021-3731?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Ledgersmb

CVE-2021-3731

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.

Published 2021-08-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.012 (67.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Ledgersmb
Ledgersmb Ledgersmb/ledgersmb — versions 1.7.33, unspecified
Debian Linux — versions 10.0, 11.0

Weakness classification (CWE)

CWE-1021 — Improper Restriction of Rendered UI Layers or Frames (Clickjacking)

References

huntr.dev/bounties/5664331d-f5f8-4412-8566-408f8655888a (Third Party Advisory)
ledgersmb.org/cve-2021-3731-clickjacking (Vendor Advisory)
www.debian.org/security/2021/dsa-4962 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3731?: CVE-2021-3731 is a medium-severity vulnerability in Ledgersmb, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 5.9/10. Published 2021-08-23.
How severe is CVE-2021-3731?: Medium severity. CVSS v3 base score is 5.9 out of 10.