CVE-2021-3694

Name: CVE-2021-3694
Creator: NVD / NIST
Published: 2021-08-23T13:15:07.78+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.6/10EPSS 2.39%

Last modified Jun 17, 2026

CVE-2021-3694 is a critical-severity vulnerability rated 9.6/10 on the CVSS scale. 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.. EPSS estimates a 2.39% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.6/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS Probability

2.39%

81.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Ledgersmb	Ledgersmb	>= 1.1.0, <= 1.1.12
Ledgersmb	Ledgersmb	>= 1.2.0, <= 1.2.26
Ledgersmb	Ledgersmb	>= 1.3.0, <= 1.3.47
Ledgersmb	Ledgersmb	>= 1.4.0, <= 1.4.42
Ledgersmb	Ledgersmb	>= 1.5.0, <= 1.5.30
Ledgersmb	Ledgersmb	>= 1.6.0, <= 1.6.33
Ledgersmb	Ledgersmb	>= 1.7.0, <= 1.7.32
Ledgersmb	Ledgersmb	>= 1.8.0, <= 1.8.17
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0

References

https://github.com/ledgersmb/ledgersmb/commit/98fa476d46a4a7e5e9492ed69b4fa190be5547fcPatch, Third Party Advisory
https://huntr.dev/bounties/ef7f4cf7-3a81-4516-b261-f5b6ac21430cThird Party Advisory
https://ledgersmb.org/cve-2021-3694-cross-site-scriptingVendor Advisory
https://www.debian.org/security/2021/dsa-4962Third Party Advisory
https://github.com/ledgersmb/ledgersmb/commit/98fa476d46a4a7e5e9492ed69b4fa190be5547fcPatch, Third Party Advisory
https://huntr.dev/bounties/ef7f4cf7-3a81-4516-b261-f5b6ac21430cThird Party Advisory
https://ledgersmb.org/cve-2021-3694-cross-site-scriptingVendor Advisory
https://www.debian.org/security/2021/dsa-4962Third Party Advisory

Timeline

Published: Aug 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3694?

How severe is CVE-2021-3694?

CVE-2021-3694 has a CVSS score of 9.6/10 (CRITICAL severity). The EPSS model estimates a 2.39% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3694?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3694?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST