CVE-2021-3694
No exploitation reported by the sources we read.
- Published2021-08-23
- WeaknessCWE-79
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
LedgerSMB does not sufficiently HTML-encode error messages sent to the browser. By sending a specially crafted URL to an authenticated user, this flaw can be abused for remote code execution and information disclosure.
Timeline
dates in UTC- 2021-08-2313:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-3694?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-3694?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 1.1 | ≥ 1.1.0, ≤ 1.1.12 | no fix published | NVD |
| 1.2 | ≥ 1.2.0, ≤ 1.2.26 | no fix published | NVD |
| 1.3 | ≥ 1.3.0, ≤ 1.3.47 | no fix published | NVD |
| 1.4 | ≥ 1.4.0, ≤ 1.4.42 | no fix published | NVD |
| 1.5 | ≥ 1.5.0, ≤ 1.5.30 | no fix published | NVD |
| 1.6 | ≥ 1.6.0, ≤ 1.6.33 | no fix published | NVD |
| 1.7 | ≥ 1.7.0, ≤ 1.7.32 | no fix published | NVD |
| 1.8 | ≥ 1.8.0, ≤ 1.8.17 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 10.0 | = 10.0 | no fix published | NVD |
| 11.0 | = 11.0 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
Advisories and patches
- github.comPatch
- ledgersmb.orgVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- Published
- 2021-08-23
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-3694?
Is CVE-2021-3694 actively exploited?
What is the CVSS score for CVE-2021-3694?
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Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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