How severe is CVE-2021-3693?

CVE-2021-3693 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-3693 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3693?

CVE-2021-3693 primarily affects Ledgersmb. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-3693?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-3693 published?

CVE-2021-3693 was published on 2021-08-23 and last updated on 2026-06-17.

CVE-2021-3693

CVE-2021-3693 is a high-severity vulnerability in Ledgersmb with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Ledgersmb
Published: 2021-08-23
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-3693?: 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.
How severe is CVE-2021-3693?: CVE-2021-3693 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-3693 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3693?: CVE-2021-3693 primarily affects Ledgersmb. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-3693?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-3693 published?: CVE-2021-3693 was published on 2021-08-23 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

More vulnerabilities in Ledgersmb

CVE-2007-5372 — Critical (CVSS 10.0): Multiple SQL injection vulnerabilities in (a) LedgerSMB 1.0.0 through 1.2.7 and (b) DWS Systems SQL-Ledger 2.x allow…
CVE-2007-3907 — Critical (CVSS 10.0): Unspecified vulnerability in login.pl in LedgerSMB 1.2.0 through 1.2.6 allows remote attackers to bypass authentication…
CVE-2007-1329 — Critical (CVSS 10.0): Directory traversal vulnerability in SQL-Ledger, and LedgerSMB before 1.1.5, allows remote attackers to read and…
CVE-2018-9246 — Critical (CVSS 9.8): The PGObject::Util::DBAdmin module before 0.120.0 for Perl, as used in LedgerSMB through 1.5.x, insufficiently…
CVE-2007-1437 — Critical (CVSS 9.0): Unspecified vulnerability in LedgerSMB before 1.1.5 and SQL-Ledger before 2.6.25 allows remote attackers to overwrite…
CVE-2021-3694 — High (CVSS 8.2): LedgerSMB does not sufficiently HTML-encode error messages sent to the browser. By sending a specially crafted URL to…

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