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Fencer Vulns
medium 5.9

CVE-2021-3731 json

Improper Restriction of Rendered UI Layers or Frames in ledgersmb/ledgersmb

published 2021-08-23 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-27008

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

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.

Patch / fix

  • ledgersmb ledgersmb/ledgersmb 1.7.33, 1.8.18
  • ledgersmb Debian 12 1.6.9+ds-2.1

debian advisories DEBIAN-CVE-2021-3731

  • ledgersmb Ubuntu 20.04 LTS 1.6.9+ds-1ubuntu0.1
  • ledgersmb Ubuntu Pro 16.04 LTS 1.3.46-1ubuntu0.1~esm1
  • ledgersmb Ubuntu Pro 18.04 LTS 1.4.42+ds-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-3731

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Exploit prediction

1.24% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N
NVD 3.1 4.7 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • ledgersmb ledgersmb/ledgersmb

Classification

Weakness
  • CWE-1021 Improper Restriction of Rendered UI Layers or Frames

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.