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CVE-2021-3694

30
FAUCET Score

CVE-2021-3694 is a critical cross-site scripting (XSS) vulnerability affecting LedgerSMB, specifically Debian Linux distributions. It arises from insufficient HTML encoding of error messages, allowing an attacker to inject malicious code via a specially crafted URL. This flaw carries a CVSS score of 9.6, indicating a critical risk with network-based attacks, low complexity, and potential for complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code, the vulnerability has garnered significant community discussion, with 10 mentions across various platforms.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.1.0, <= 1.1.12CPE matchmatch criteria
cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*
>= 1.2.0, <= 1.2.26CPE matchmatch criteria
cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*
>= 1.3.0, <= 1.3.47CPE matchmatch criteria
cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*
>= 1.4.0, <= 1.4.42CPE matchmatch criteria
cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*
>= 1.5.0, <= 1.5.30CPE matchmatch criteria
cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.2HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
4.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.39%
Probability of exploitation in next 30 days
EPSS Percentile
82.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0239 is in the 86th percentile among its peer group of 836 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.8 Bluesky, 0.5 Mastodon, and 1.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / ledgersmb/ledgersmb/commit/98fa476d46a4a7e5e9492ed69b4fa190be5547fc
PatchThird Party Advisory
huntr.dev / bounties/ef7f4cf7-3a81-4516-b261-f5b6ac21430c
Third Party Advisory
ledgersmb.org / cve-2021-3694-cross-site-scripting
Vendor Advisory
debian.org / security/2021/dsa-4962
Third Party Advisory