How severe is CVE-2017-12623?

CVE-2017-12623 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2017-12623 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-12623?

CVE-2017-12623 primarily affects Apache Nifi. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-12623?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-12623 published?

CVE-2017-12623 was published on 2017-10-10 and last updated on 2026-06-17.

CVE-2017-12623

CVE-2017-12623 is a medium-severity vulnerability in Apache Nifi with a CVSS 3.x base score of 6.5. 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-611.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-611
Affected product: Apache Nifi
Published: 2017-10-10
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2017-12623?: CVE-2017-12623 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2017-12623 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-12623?: CVE-2017-12623 primarily affects Apache Nifi. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-12623?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-12623 published?: CVE-2017-12623 was published on 2017-10-10 and last updated on 2026-06-17.

References

https://nifi.apache.org/security.html#CVE-2017-12623

Affected products (7)

cpe:2.3:a:apache:nifi:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:nifi:1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:nifi:1.1.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:nifi:1.1.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:nifi:1.1.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:nifi:1.2.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:nifi:1.3.0:*:*:*:*:*:*:*

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