CVE-2017-12623

An authorized user could upload a template which contained malicious code and accessed sensitive files via an XML External Entity (XXE) attack. The fix to properly handle XML External Entities was applied on the Apache NiFi 1.4.0 release. Users running a prior 1.x release should upgrade to the appropriate release.

Published: 2017-10-10 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-12623 is rated Moderate Risk (54.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.94%). EPSS rose +1.64% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2017-12623

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 0.30% 1.94% +1.64%
2 2026-02-11 0.51% 0.30% -0.21%
3 2025-07-08 — 0.51% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-12623

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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:L)
A normal user session is enough; they don’t have to be admin.
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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 3.6 [email protected]
4.0 2.0 MEDIUM
AV:N/AC:L/Au:S/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:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.0 2.9 [email protected]

Weakness enumeration for CVE-2017-12623

GitHub Security Advisory for CVE-2017-12623

GHSA-qj7f-j6h9-g5rq · Severity: medium · Ecosystem: maven — XML External Entity Reference in Apache NiFi

Affected software / configurations for CVE-2017-12623

Vendor Product Version Raw CPE
apache nifi 1.0.0 cpe:2.3:a:apache:nifi:1.0.0:*:*:*:*:*:*:*
apache nifi 1.0.1 cpe:2.3:a:apache:nifi:1.0.1:*:*:*:*:*:*:*
apache nifi 1.1.0 cpe:2.3:a:apache:nifi:1.1.0:*:*:*:*:*:*:*
apache nifi 1.1.1 cpe:2.3:a:apache:nifi:1.1.1:*:*:*:*:*:*:*
apache nifi 1.1.2 cpe:2.3:a:apache:nifi:1.1.2:*:*:*:*:*:*:*
apache nifi 1.2.0 cpe:2.3:a:apache:nifi:1.2.0:*:*:*:*:*:*:*
apache nifi 1.3.0 cpe:2.3:a:apache:nifi:1.3.0:*:*:*:*:*:*:*

References for CVE-2017-12623

cvelogic Threat Intelligence