CVE-2021-3693

Name: CVE-2021-3693
Creator: NVD / NIST
Published: 2021-08-23T13:15:07.72+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.6/10EPSS 3.01%

Last modified Jun 17, 2026

CVE-2021-3693 is a critical-severity vulnerability rated 9.6/10 on the CVSS scale. LedgerSMB does not check the origin of HTML fragments merged into the browser's DOM. 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 3.01% chance of exploitation in the next 30 days.

Description

LedgerSMB does not check the origin of HTML fragments merged into the browser's DOM. 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

3.01%

85.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
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://huntr.dev/bounties/daf1384d-648a-43fd-9b35-5c37d8ead667Third Party Advisory
https://ledgersmb.org/cve-2021-3693-cross-site-scriptingPatch, Vendor Advisory
https://www.debian.org/security/2021/dsa-4962Third Party Advisory
https://huntr.dev/bounties/daf1384d-648a-43fd-9b35-5c37d8ead667Third Party Advisory
https://ledgersmb.org/cve-2021-3693-cross-site-scriptingPatch, Vendor 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-2021-3693?

How severe is CVE-2021-3693?

CVE-2021-3693 has a CVSS score of 9.6/10 (CRITICAL severity). The EPSS model estimates a 3.01% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3693?

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-2021-3693?

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

Scan your code now

Source: NVD / NIST