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Fencer Vulns
high 8.2

CVE-2021-3694 json

Cross-site Scripting (XSS) - Reflected in ledgersmb/ledgersmb

published 2021-08-23 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26979

cvss
8.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.5%
EPSS 2.5% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

LedgerSMB does not sufficiently HTML-encode error messages sent to the browser. By sending a specially crafted URL to an authenticated user, this flaw can be abused for remote code execution and information disclosure.

Patch / fix

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

debian advisories DEBIAN-CVE-2021-3694

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

ubuntu advisories UBUNTU-CVE-2021-3694

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

2.51% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
NVD 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • ledgersmb ledgersmb/ledgersmb

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

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.