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NVD / CVE Program· CNA @huntrdev

CVE-2021-3693: Cross-site Scripting (XSS) - DOM in ledgersmb/ledgersmb

Noroxi assessment

Priority: Monitor (action score 39/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 3.1% (FIRST EPSS); higher than 88% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: ledgersmb (Debian:10) 1.6.9+ds-1+deb10u2; ledgersmb (Debian:11) 1.6.9+ds-2+deb11u2; ledgersmb (Debian:12) 1.6.9+ds-2.1.

Low priority for now. Upgrade to ledgersmb (Debian:10) 1.6.9+ds-1+deb10u2; ledgersmb (Debian:11) 1.6.9+ds-2+deb11u2; ledgersmb (Debian:12) 1.6.9+ds-2.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

CriticalCVSS 9.6 · v3.1—No exploit Fix available
Published
Aug 23, 2021
Updated
Jun 17, 2026
EPSS
3.1% · 88th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
38 / 40 · 9.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.1%

CNA vs NVD score

NVD
9.6
CNA · @huntrdev
8.8
0.8 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-3693

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
ledgersmbledgersmb
debiandebian linux

Limit the impact of XSS

This is a cross-site scripting (XSS) vulnerability. A well-configured Content-Security-Policy doesn't fix it, but greatly reduces its impact. Check your site's CSP and other security headers for free.

Check security headers

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • debian debian linux11.0
  • ledgersmb ledgersmb1.5.0 and later · up to 1.5.30 inclusive
  • ledgersmb ledgersmb1.6.0 and later · up to 1.6.33 inclusive
  • ledgersmb ledgersmb1.7.0 and later · up to 1.7.32 inclusive
  • ledgersmb ledgersmb1.8.0 and later · up to 1.8.17 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (@huntrdev). Independent of NVD's CPE analysis and usually ahead of it.

  • ledgersmb ledgersmb/ledgersmb

    • 1.7.33not affected
    • unspecified and later · before 1.8.18affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:10ledgersmbbefore 1.6.9+ds-1+deb10u21.6.9+ds-1+deb10u2
Debian:11ledgersmbbefore 1.6.9+ds-2+deb11u21.6.9+ds-2+deb11u2
Debian:12ledgersmbbefore 1.6.9+ds-2.11.6.9+ds-2.1

Same product

ledgersmb: all records

Other highest-scoring records for the same primary product.

  • CVE-2007-1329Directory traversal vulnerability in SQL-Ledger, and LedgerSMB before 1.1.5, allows remote attackers to read and overwrite arbitrary files,
    42Plan
  • CVE-2007-5372Multiple SQL injection vulnerabilities in (a) LedgerSMB 1.0.0 through 1.2.7 and (b) DWS Systems SQL-Ledger 2.x allow remote attackers to exe
    41Plan
  • CVE-2007-3907Unspecified vulnerability in login.pl in LedgerSMB 1.2.0 through 1.2.6 allows remote attackers to bypass authentication and perform certain
    41Plan

Published before and after this one in the same product

  • ← EarlierCVE-2008-4078Sep 15, 2008 · SQL injection vulnerability in the AR/AP transaction report in (1) LedgerSMB (LSMB) before 1.2.15 and (2) SQL-Ledger 2.8.17 and earlier allo
    26Monitor
  • ← EarlierCVE-2018-9246Jun 7, 2018 · The PGObject::Util::DBAdmin module before 0.120.0 for Perl, as used in LedgerSMB through 1.5.x, insufficiently sanitizes or escapes variable
    40Plan
  • Later →CVE-2021-3694Aug 23, 2021 · Cross-site Scripting (XSS) - Reflected in ledgersmb/ledgersmb
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:ledgersmb1.6.9+ds-2.1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

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

nvd-primary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records