How severe is CVE-2019-12421?

CVE-2019-12421 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-12421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12421?

CVE-2019-12421 affects Apache Nifi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-12421?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-12421 published?

CVE-2019-12421 was published on 2019-11-19 and last updated on 2026-06-17.

CVE-2019-12421

CVE-2019-12421 is a high-severity vulnerability in Apache Nifi with a CVSS 3.x base score of 8.8. 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-613.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-613
Affected product: Apache Nifi
Published: 2019-11-19
Last modified: 2026-06-17

Description

When using an authentication mechanism other than PKI, when the user clicks Log Out in NiFi versions 1.0.0 to 1.9.2, NiFi invalidates the authentication token on the client side but not on the server side. This permits the user's client-side token to be used for up to 12 hours after logging out to make API requests to NiFi.

Frequently asked questions

What is CVE-2019-12421?: When using an authentication mechanism other than PKI, when the user clicks Log Out in NiFi versions 1.0.0 to 1.9.2, NiFi invalidates the authentication token on the client side but not on the server side. This permits the user's client-side token to be used for up to 12 hours after logging out to make API requests to NiFi.
How severe is CVE-2019-12421?: CVE-2019-12421 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-12421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12421?: CVE-2019-12421 affects Apache Nifi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-12421?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-12421 published?: CVE-2019-12421 was published on 2019-11-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:nifi:*:*:*:*:*:*:*:*

More vulnerabilities in Apache Nifi

CVE-2018-1309 — Critical (CVSS 9.8): Apache NiFi External XML Entity issue in SplitXML processor. Malicious XML content could cause information disclosure…
CVE-2017-15697 — Critical (CVSS 9.8): A malicious X-ProxyContextPath or X-Forwarded-Context header containing external resources or embedded code could cause…
CVE-2017-5636 — Critical (CVSS 9.8): In Apache NiFi before 0.7.2 and 1.x before 1.1.2 in a cluster environment, the proxy chain…
CVE-2026-39816 — High (CVSS 8.8): The optional extension component TinkerpopClientService is missing the Restricted annotation with the Execute Code…
CVE-2025-66524 — High (CVSS 8.8): Apache NiFi 1.20.0 through 2.6.0 include the GetAsanaObject Processor, which requires integration with a configurable…
CVE-2023-36542 — High (CVSS 8.8): Apache NiFi 0.0.2 through 1.22.0 include Processors and Controller Services that support HTTP URL references for…

All CVEs affecting Apache Nifi →

Other CWE-613 (Insufficient Session Expiration) vulnerabilities

CVE-2024-8888 — Critical (CVSS 10.0): An attacker with access to the network where CIRCUTOR Q-SMT is located in its firmware version 1.0.4, could steal the…
CVE-2026-46455 — Critical (CVSS 9.8): Insufficient Session Expiration vulnerability in Apache Camel Keycloak Component. The camel-keycloak security helper…
CVE-2026-21622 — Critical (CVSS 9.8): Insufficient Session Expiration vulnerability in hexpm hexpm/hexpm ('Elixir.Hexpm.Accounts.PasswordReset' module)…
CVE-2025-59786 — Critical (CVSS 9.8): 2N Access Commander version 3.4.2 and prior improperly invalidates session tokens, allowing multiple session cookies to…
CVE-2026-26342 — Critical (CVSS 9.8): Tattile Smart+, Vega, and Basic device families firmware versions 1.181.5 and prior implement an authentication token…
CVE-2026-1435 — Critical (CVSS 9.8): Not properly invalidated session vulnerability in Graylog Web Interface, version 2.2.3, due to incorrect management of…

Browse all CWE-613 (Insufficient Session Expiration) vulnerabilities →