CVE-2018-6409

Exp

An issue was discovered in Appnitro MachForm before 4.2.3. The module in charge of serving stored files gets the path from the database. Modifying the name of the file to serve on the corresponding ap_form table leads to a path traversal vulnerability via the download.php q parameter.

Published: 2018-05-26 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-6409 is rated High Exploit Risk (72/100): CVSS Medium severity, with high exploitation likelihood (EPSS 14.76%, 96th percentile). 3 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.09% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2018-6409

EDB-ID Source Kind Published Link
44804 exploit_db edb 2018-05-30 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2018-6409

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 12.67% 14.76% +2.09%
2 2026-03-04 10.14% 12.67% +2.53%
3 2026-03-01 — 10.14% —

Full EPSS history (46 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-6409

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2018-6409

Affected software / configurations for CVE-2018-6409

Vendor Product Version Raw CPE
machform machform 4.2.3 cpe:2.3:a:machform:machform:4.2.3:*:*:*:*:*:*:*

References for CVE-2018-6409

URL Tags
https://metalamin.github.io/MachForm-not-0-day-EN/ Exploit Third Party Advisory
https://www.exploit-db.com/exploits/44804/ Exploit Third Party Advisory VDB Entry
https://www.machform.com/blog-machform-423-security-release/ Release Notes Vendor Advisory
cvelogic Threat Intelligence