What is CVE-2021-3694?

CVE-2021-3694 is a high-severity vulnerability in Ledgersmb, classified under Cross-site Scripting. CVSS score: 8.2/10. Published 2021-08-23.

How severe is CVE-2021-3694?

High severity. CVSS v3 base score is 8.2 out of 10.

XSS in Ledgersmb

CVE-2021-3694

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.

Vulnerability class: XSS (Cross-Site Scripting)

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

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.025 (84.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · 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-79 — Cross-site Scripting

References

huntr.dev/bounties/ef7f4cf7-3a81-4516-b261-f5b6ac21430c (Third Party Advisory)
github.com/ledgersmb/ledgersmb/commit/98fa476d46a4a7e5e9492ed69b4fa190be5547fc (Patch, Third Party Advisory)
ledgersmb.org/cve-2021-3694-cross-site-scripting (Vendor Advisory)
www.debian.org/security/2021/dsa-4962 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3694?: CVE-2021-3694 is a high-severity vulnerability in Ledgersmb, classified under Cross-site Scripting. CVSS score: 8.2/10. Published 2021-08-23.
How severe is CVE-2021-3694?: High severity. CVSS v3 base score is 8.2 out of 10.