RADIUS Protocol under RFC 2865 is susceptible to forgery attacks by a local attacker who can modify any valid Response (Access-Accept, Access-Reject, or Access-Challenge) to any other response using a chosen-prefix collision attack against MD5 Response Authenticator signature.
https://cert-portal.siemens.com/productcert/html/ssa-794185.html
https://cert-portal.siemens.com/productcert/html/ssa-723487.html
https://security.netapp.com/advisory/ntap-20240822-0001/
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0014
https://networkradius.com/assets/pdf/radius_and_md5_collisions.pdf
https://www.securityweek.com/juniper-networks-patches-critical-junos-space-vulnerabilities/
https://www.cisa.gov/news-events/ics-advisories/icsa-25-135-05
https://securityaffairs.com/165641/security/palo-alto-networks-critical-bug-expedition.html
https://www.cisa.gov/news-events/ics-advisories/icsa-24-193-05
https://blog.cloudflare.com/radius-udp-vulnerable-md5-attack
Published: 2024-07-09
Updated: 2025-09-04
Named Vulnerability: BlastRADIUSNamed Vulnerability: Blast-RADIUS
Base Score: 7.6
Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C
Severity: High
Base Score: 9
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Severity: Critical
Base Score: 9.2
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Severity: Critical
EPSS: 0.19036