CVE-2021-3693

Ledgersmb vulnerability

CVSS

8.8

EPSS

3.0%

EPSS pct

86th

Exploited

No known

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.

Affected vendor

Ledgersmb

Affected product

Ledgersmb

CVSS vector

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

Weakness type (CWE)

CWE-79 — Cross-Site Scripting (XSS)

Published

2021-08-23

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 3.0% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 86% of all scored CVEs.

Check your external exposure to CVE-2021-3693

Confirm whether Ledgersmb Ledgersmb is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-3693.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-3693

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-3693 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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