How severe is CVE-2017-9148?

CVE-2017-9148 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-9148 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-9148?

CVE-2017-9148 primarily affects Freeradius. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-9148?

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

When was CVE-2017-9148 published?

CVE-2017-9148 was published on 2017-05-29 and last updated on 2026-06-17.

CVE-2017-9148

CVE-2017-9148 is a critical-severity vulnerability in Freeradius with a CVSS 3.x base score of 9.8. 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-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Freeradius
Published: 2017-05-29
Last modified: 2026-06-17

Description

The TLS session cache in FreeRADIUS 2.1.1 through 2.1.7, 3.0.x before 3.0.14, 3.1.x before 2017-02-04, and 4.0.x before 2017-02-04 fails to reliably prevent resumption of an unauthenticated session, which allows remote attackers (such as malicious 802.1X supplicants) to bypass authentication via PEAP or TTLS.

Frequently asked questions

What is CVE-2017-9148?: The TLS session cache in FreeRADIUS 2.1.1 through 2.1.7, 3.0.x before 3.0.14, 3.1.x before 2017-02-04, and 4.0.x before 2017-02-04 fails to reliably prevent resumption of an unauthenticated session, which allows remote attackers (such as malicious 802.1X supplicants) to bypass authentication via PEAP or TTLS.
How severe is CVE-2017-9148?: CVE-2017-9148 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-9148 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-9148?: CVE-2017-9148 primarily affects Freeradius. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-9148?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-9148 published?: CVE-2017-9148 was published on 2017-05-29 and last updated on 2026-06-17.

References

Affected products (21)

cpe:2.3:a:freeradius:freeradius:2.1.1:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:2.1.2:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:2.1.3:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:2.1.4:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:2.1.6:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:2.1.7:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:3.0.0:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:3.0.1:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:3.0.2:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:3.0.3:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:3.0.4:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:3.0.5:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:3.0.6:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:3.0.7:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:3.0.8:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:3.0.9:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:3.1.0:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:3.1.1:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:3.1.2:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:3.1.3:*:*:*:*:*:*:*
cpe:2.3:a:freeradius:freeradius:4.0.0:*:*:*:*:*:*:*

More vulnerabilities in Freeradius

CVE-2019-11235 — Critical (CVSS 9.8): FreeRADIUS before 3.0.19 mishandles the "each participant verifies that the received scalar is within a range, and that…
CVE-2019-11234 — Critical (CVSS 9.8): FreeRADIUS before 3.0.19 does not prevent use of reflection for authentication spoofing, aka a "Dragonblood" issue, a…
CVE-2017-10984 — Critical (CVSS 9.8): An FR-GV-301 issue in FreeRADIUS 3.x before 3.0.15 allows "Write overflow in data2vp_wimax()" - this allows remote…
CVE-2017-10979 — Critical (CVSS 9.8): An FR-GV-202 issue in FreeRADIUS 2.x before 2.2.10 allows "Write overflow in rad_coalesce()" - this allows remote…
CVE-2024-3596 — Critical (CVSS 9.0): RADIUS Protocol under RFC 2865 is susceptible to forgery attacks by a local attacker who can modify any valid Response…
CVE-2015-8764 — High (CVSS 8.1): Off-by-one error in the EAP-PWD module in FreeRADIUS 3.0 through 3.0.8, which triggers a buffer overflow.

All CVEs affecting Freeradius →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →