How severe is CVE-2020-11650?

CVE-2020-11650 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-11650 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-11650?

CVE-2020-11650 primarily affects Ixsystems Freenas Firmware. In total, 36 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-11650?

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-2020-11650 published?

CVE-2020-11650 was published on 2020-04-08 and last updated on 2026-06-17.

CVE-2020-11650

CVE-2020-11650 is a high-severity vulnerability in Ixsystems Freenas Firmware with a CVSS 3.x base score of 7.5. 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-307.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-307
Affected product: Ixsystems Freenas Firmware
Published: 2020-04-08
Last modified: 2026-06-17

Description

An issue was discovered in iXsystems FreeNAS (and TrueNAS) 11.2 before 11.2-u8 and 11.3 before 11.3-U1. It allows a denial of service. The login authentication component has no limits on the length of an authentication message or the rate at which such messages are sent.

Frequently asked questions

What is CVE-2020-11650?: An issue was discovered in iXsystems FreeNAS (and TrueNAS) 11.2 before 11.2-u8 and 11.3 before 11.3-U1. It allows a denial of service. The login authentication component has no limits on the length of an authentication message or the rate at which such messages are sent.
How severe is CVE-2020-11650?: CVE-2020-11650 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-11650 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-11650?: CVE-2020-11650 primarily affects Ixsystems Freenas Firmware. In total, 36 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-11650?: 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-2020-11650 published?: CVE-2020-11650 was published on 2020-04-08 and last updated on 2026-06-17.

References

Affected products (36)

cpe:2.3:o:ixsystems:freenas_firmware:11.2:-:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.2:u1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.2:u2:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.2:u2.1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.2:u3:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.2:u4:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.2:u4.1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.2:u5:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.2:u5.1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.2:u6:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.2:u6.1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.2:u7:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.3:-:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.3:alpha1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.3:alpha2:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.3:beta1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.3:rc1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:freenas_firmware:11.3:rc2:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.2:-:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.2:u1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.2:u2:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.2:u2.1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.2:u3:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.2:u4:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.2:u4.1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.2:u5:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.2:u5.1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.2:u6:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.2:u6.1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.2:u7:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.3:-:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.3:alpha1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.3:alpha2:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.3:beta1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.3:rc1:*:*:*:*:*:*
cpe:2.3:o:ixsystems:truenas_firmware:11.3:rc2:*:*:*:*:*:*

Other CWE-307 (Improper Restriction of Excessive Authentication Attempts) vulnerabilities

CVE-2026-6853 — Critical (CVSS 9.8): Improper restriction of excessive authentication attempts vulnerability in Başbelen Group Food Cafe Businesses…
CVE-2026-8760 — Critical (CVSS 9.8): The Login with OTP plugin for WordPress is vulnerable to authentication bypass in all versions up to, and including,…
CVE-2020-37228 — Critical (CVSS 9.8): iDS6 DSSPro Digital Signage System 6.2 contains a CAPTCHA security bypass vulnerability that allows attackers to bypass…
CVE-2026-33879 — Critical (CVSS 9.8): Federated Learning and Interoperability Platform (FLIP) is an open-source platform for federated training and…
CVE-2026-33640 — Critical (CVSS 9.8): Outline is a service that allows for collaborative documentation. Outline implements an Email OTP login flow for users…
CVE-2026-31851 — Critical (CVSS 9.8): Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 does not implement rate limiting or account lockout…

Browse all CWE-307 (Improper Restriction of Excessive Authentication Attempts) vulnerabilities →