Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| IETF | RFC | 2865 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | freeradius | 3.2.5+dfsg-1 | — |
| Debian 13 | freeradius | 3.2.5+dfsg-1 | — |
| Debian 12 | freeradius | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | freeradius | 3.2.5+dfsg-3~ubuntu24.04.1 | USN-7055-1 |
| Ubuntu 24.04 LTS | krb5 | 1.20.1-6ubuntu2.3 | USN-7257-1 |
| Ubuntu 24.04 LTS | libpam-radius-auth | No fix yet | — |
| Ubuntu 22.04 LTS | freeradius | 3.0.26~dfsg~git20220223.1.00ed0241fa-0ubuntu3.3 | USN-7055-1 |
| Ubuntu 22.04 LTS | krb5 | 1.19.2-2ubuntu0.5 | USN-7257-1 |
| Ubuntu 22.04 LTS | libpam-radius-auth | No fix yet | — |
| Ubuntu 20.04 LTS | freeradius | 3.0.20+dfsg-3ubuntu0.4 | USN-7055-1 |
| Ubuntu 20.04 LTS | krb5 | 1.17-6ubuntu4.8 | USN-7257-1 |
| Ubuntu 20.04 LTS | libpam-radius-auth | No fix yet | — |
| Ubuntu 18.04 LTS | freeradius +1 | No fix yet | — |
| Ubuntu 16.04 LTS | libpam-radius-auth | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | krb5 | 1.16-2ubuntu0.4+esm3 | USN-7257-1 |
| Ubuntu Pro 16.04 LTS | freeradius | No fix yet | — |
| Ubuntu Pro 16.04 LTS | krb5 | 1.13.2+dfsg-5ubuntu2.2+esm6 | USN-7257-1 |
| Ubuntu Pro 14.04 LTS | krb5 | 1.12+dfsg-2ubuntu5.4+esm6 | USN-7257-1 |
| Ubuntu Pro 14.04 LTS | libpam-radius-auth | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | freeradius +12 | 3.0.21-40.el9_4 | RHSA-2024:4935 |
| RHEL 9 | krb5 +7 | 1.21.1-4.el9_5 | RHSA-2024:9474 |
| RHEL 8 | freeradius +12 | 3.0.20-15.module+el8.10.0+22065+aa3d48ca | RHSA-2024:4936 |
| RHEL 8 | krb5 +7 | 1.18.2-30.el8_10 | RHSA-2024:8860 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | krb5 +7 | 1.21.1-2.el9_4.1 | RHSA-2024:9547 |
| RHEL 9.2 EUS | freeradius +12 | 3.0.21-38.el9_2.2 | RHSA-2024:4828 |
| RHEL 9.2 EUS | krb5 +7 | 1.20.1-9.el9_2.2 | RHSA-2024:8461 |
| RHEL 9.0 E4S | freeradius +6 | 3.0.21-26.el9_0.1 | RHSA-2024:4912 |
| RHEL 9.0 E4S | krb5 +7 | 1.19.1-16.el9_0.2 | RHSA-2024:8577 |
| RHEL 8.8 EUS | freeradius +12 | 3.0.20-14.module+el8.8.0+22090+a01d0e6a.1 | RHSA-2024:4829 |
| RHEL 8.8 EUS | krb5 +7 | 1.18.2-26.el8_8.3 | RHSA-2024:8792 |
| RHEL 8.6 TUS | freeradius +12 | 3.0.20-12.module+el8.6.0+22086+569c8c49.1 | RHSA-2024:4826 |
| RHEL 8.6 TUS | krb5 +7 | 1.18.2-16.el8_6.2 | RHSA-2024:8794 |
| RHEL 8.6 E4S | freeradius +12 | 3.0.20-12.module+el8.6.0+22086+569c8c49.1 | RHSA-2024:4826 |
| RHEL 8.6 E4S | krb5 +7 | 1.18.2-16.el8_6.2 | RHSA-2024:8794 |
| RHEL 8.6 AUS | freeradius +12 | 3.0.20-12.module+el8.6.0+22086+569c8c49.1 | RHSA-2024:4826 |
| RHEL 8.6 AUS | krb5 +7 | 1.18.2-16.el8_6.2 | RHSA-2024:8794 |
| RHEL 8.4 TUS | freeradius +12 | 3.0.20-4.module+el8.4.0+22088+2692c5cc.1 | RHSA-2024:4874 |
| RHEL 8.4 TUS | krb5 +7 | 1.18.2-9.el8_4.2 | RHSA-2024:8791 |
| RHEL 8.4 E4S | freeradius +12 | 3.0.20-4.module+el8.4.0+22088+2692c5cc.1 | RHSA-2024:4874 |
| RHEL 8.4 E4S | krb5 +7 | 1.18.2-9.el8_4.2 | RHSA-2024:8791 |
| RHEL 8.4 AUS | freeradius +12 | 3.0.20-4.module+el8.4.0+22088+2692c5cc.1 | RHSA-2024:4874 |
| RHEL 8.4 AUS | krb5 +7 | 1.18.2-9.el8_4.2 | RHSA-2024:8791 |
| RHEL 8.2 AUS | freeradius +11 | 3.0.20-1.module+el8.2.0+22148+b45f7ef2.1 | RHSA-2024:4913 |
| RHEL 8.2 AUS | krb5 +7 | 1.17-19.el8_2.2 | RHSA-2024:8789 |
| RHEL 7 ELS | freeradius +11 | 3.0.20-1.el7_9.1 | RHSA-2024:4911 |
| RHEL 7 ELS | krb5 +7 | 1.15.1-55.el7_9.3 | RHSA-2024:8788 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | freeradius +12 | 3.0.21-40.el9_4 | ALSA-2024:4935 |
| AlmaLinux 9 | libkadm5 +6 | 1.21.1-4.el9_5 | ALSA-2024:9474 |
| AlmaLinux 8 | freeradius +12 | 3.0.20-15.module_el8.10.0+3873+5b7fed0f | ALSA-2024:4936 |
| AlmaLinux 8 | libkadm5 +6 | 1.18.2-30.el8_10 | ALSA-2024:8860 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | freeradius | 3.0.21-40.el9_4 | RLSA-2024:4935 |
| Rocky Linux 9 | krb5 | 1.21.1-4.el9_5 | RLSA-2024:9474 |
| Rocky Linux 8 | freeradius | 3.0.20-15.module+el8.10.0+1841+f214069a | RLSA-2024:4936 |
| Rocky Linux 8 | krb5 | 1.18.2-30.el8_10 | RLSA-2024:8860 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | freeradius-server | 3.2.4-150600.3.3.2 | SUSE-SU-2024:2359-1 |
| SLES 15 SP5 | freeradius-server | 3.0.25-150400.4.7.1 | SUSE-SU-2024:2366-1 |
| SLES 15 SP4 | freeradius-server | 3.0.25-150400.4.7.1 | SUSE-SU-2024:2366-1 |
| SLES 15 SP3 | freeradius-server | 3.0.21-150200.3.15.1 | SUSE-SU-2024:2367-1 |
| SLES 15 SP2 | freeradius-server | 3.0.21-150200.3.15.1 | SUSE-SU-2024:2367-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | freeradius-server | 3.0.19-3.15.1 | SUSE-SU-2024:2361-1 |
| SLES for SAP 15 SP4 | freeradius-server | 3.0.25-150400.4.7.1 | SUSE-SU-2024:2366-1 |
| SLES for SAP 15 SP3 | freeradius-server | 3.0.21-150200.3.15.1 | SUSE-SU-2024:2367-1 |
| SLES for SAP 15 SP2 | freeradius-server | 3.0.21-150200.3.15.1 | SUSE-SU-2024:2367-1 |
| SLES for SAP 12 SP5 | freeradius-server | 3.0.19-3.15.1 | SUSE-SU-2024:2361-1 |
| SLE HPC 15 SP4 | freeradius-server | 3.0.25-150400.4.7.1 | SUSE-SU-2024:2366-1 |
| SLE HPC 15 SP3 | freeradius-server | 3.0.21-150200.3.15.1 | SUSE-SU-2024:2367-1 |
| SLE HPC 15 SP2 | freeradius-server | 3.0.21-150200.3.15.1 | SUSE-SU-2024:2367-1 |
| SUSE Manager Server 4.3 | freeradius-server | 3.0.25-150400.4.7.1 | SUSE-SU-2024:2366-1 |
| SUSE Manager Proxy 4.3 | freeradius-server | 3.0.25-150400.4.7.1 | SUSE-SU-2024:2366-1 |
| SUSE Enterprise Storage 7.1 | freeradius-server | 3.0.21-150200.3.15.1 | SUSE-SU-2024:2367-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | radcli | 1.5.0-1.1 | openSUSE-SU-2026:10528-1 |
| openSUSE Leap 15.6 | freeradius-server | 3.2.4-150600.3.3.2 | SUSE-SU-2024:2359-1 |
| openSUSE Leap 15.5 | freeradius-server | 3.0.25-150400.4.7.1 | SUSE-SU-2024:2366-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | freeradius | 3.0.27-r0 | — |
| Alpine v3.23 | freeradius | 3.0.27-r0 | — |
| Alpine v3.22 | freeradius | 3.0.27-r0 | — |
| Alpine v3.21 | freeradius | 3.0.27-r0 | — |
| Alpine v3.20 | freeradius | 3.0.27-r0 | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | freeradius | 3.0.27-r0 | — |
| Alpine v3.18 | freeradius | 3.0.27-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | freeradius +11 | 3.0.27-1.amzn2.0.1 | ALAS2-2024-2611 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | freeradius +12 | 3.0.21-40.el9_4 | ELSA-2024-4935 |
| Oracle Linux 9 | libkadm5 +6 | 1.21.1-4.0.1.el9_5 | ELSA-2024-9474 |
| Oracle Linux 8 | freeradius +12 | 3.0.20-15.module+el8.10.0+90375+641abe33 | ELSA-2024-4936 |
| Oracle Linux 8 | libkadm5 +6 | 1.18.2-30.0.1.el8_10 | ELSA-2024-8860 |
| Oracle Linux 7 | freeradius +11 | 3.0.13-15.0.1.el7 | ELSA-2024-4911 |
| Oracle Linux 7 | libkadm5 +6 | 1.15.1-55.0.7.el7_9 | ELSA-2024-8788 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
alperenugurlu/CVE-2024-3596-Detector ★ 7 · Jul 9, 2024
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 50
- ALSA-2024:9474 Important: krb5 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:4935 Important: freeradius security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:8860 Important: krb5 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:4936 Important: freeradius:3.0 security update AlmaLinux Security Advisories · Oct 29, 2026
- SSA-794185 SSA-794185: RADIUS Protocol Susceptible to Forgery Attacks (CVE-2024-3596) - Impact to SIPROTEC, SICAM and Related Products Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2025-0148 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- ICSA-24-193-05 Siemens SCALANCE, RUGGEDCOM, SIPLUS, and SINEC CISA ICS & IT advisories · Jul 9, 2026
- ICSA-25-135-05 Siemens SIPROTEC and SICAM CISA ICS & IT advisories · Jul 7, 2026
- RHSA-2024:4828 Red Hat Security Advisory: freeradius security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2024:4935 Red Hat Security Advisory: freeradius security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2024:9474 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2024:9547 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2024:8577 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2024:8461 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2024:4911 Red Hat Security Advisory: freeradius security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-7257-1 krb5 vulnerability Ubuntu Security Notices (USN) · Jun 25, 2026
- ICSA-26-160-01 Schneider Electric Modicon Network Managed Switches CISA ICS & IT advisories · Jun 9, 2026
- SSA-723487 SSA-723487: RADIUS Protocol Susceptible to Forgery Attacks (CVE-2024-3596) - Impact to SCALANCE, RUGGEDCOM and Related Products Siemens ProductCERT · Jun 9, 2026
- USN-7055-1 freeradius vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- RHSA-2024:8860 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Apr 23, 2026
- RHSA-2024:8792 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Apr 23, 2026
- RHSA-2024:8794 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Apr 23, 2026
- RHSA-2024:8789 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Apr 23, 2026
- RHSA-2024:8791 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Apr 23, 2026
- RHSA-2024:8788 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Apr 23, 2026
- RHSA-2024:4936 Red Hat Security Advisory: freeradius:3.0 security update Red Hat Security Advisories (RHSA) · Apr 23, 2026
- RHSA-2024:4912 Red Hat Security Advisory: freeradius security update Red Hat Security Advisories (RHSA) · Apr 23, 2026
- RHSA-2024:4913 Red Hat Security Advisory: freeradius:3.0 security update Red Hat Security Advisories (RHSA) · Apr 23, 2026
- RHSA-2024:4829 Red Hat Security Advisory: freeradius:3.0 security update Red Hat Security Advisories (RHSA) · Apr 23, 2026
- RHSA-2024:4874 Red Hat Security Advisory: freeradius:3.0 security update Red Hat Security Advisories (RHSA) · Apr 23, 2026
- RHSA-2024:4826 Red Hat Security Advisory: freeradius:3.0 security update Red Hat Security Advisories (RHSA) · Apr 23, 2026
- SEVD-2026-104-02 Third-Party vulnerability on Modicon Networking Managed Switches Schneider Electric CPCERT · Apr 14, 2026
- openSUSE-SU-2026:10528-1 libradcli10-1.5.0-1.1 on GA media SUSE / openSUSE Security Updates · Apr 11, 2026
- ICSA-25-044-06 Siemens RUGGEDCOM APE1808 CISA ICS & IT advisories · Mar 12, 2026
- SSA-770770 SSA-770770: Multiple Vulnerabilities in Fortigate NGFW Before V7.4.7 on RUGGEDCOM APE1808 Devices Siemens ProductCERT · Mar 10, 2026
- RLSA-2024:9474 Important: krb5 security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2024:4936 Important: freeradius:3.0 security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2024:8860 Important: krb5 security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2024:4935 Important: freeradius security update Rocky Linux Security Advisories · Feb 5, 2026
- ICSA-26-036-06 Hitachi Energy FOX61x CISA ICS & IT advisories · Feb 5, 2026
- ICSA-26-036-05 Hitachi Energy XMC20 CISA ICS & IT advisories · Feb 5, 2026
- SUSE-SU-2024:2367-1 Security update for freeradius-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2359-1 Security update for freeradius-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2361-1 Security update for freeradius-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2366-1 Security update for freeradius-server SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-1578 RADIUS: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Feb 2, 2026
- ICSA-24-193-11 Siemens RUGGEDCOM APE 1808 CISA ICS & IT advisories · Jan 14, 2026
- SSA-364175 SSA-364175: Multiple Vulnerabilities in Palo Alto Networks Virtual NGFW on RUGGEDCOM APE1808 Devices Before V11.1.4-h1 Siemens ProductCERT · Jan 13, 2026
- ICSA-25-350-03 Hitachi Energy AFS, AFR and AFF Series CISA ICS & IT advisories · Dec 16, 2025
- WID-SEC-2025-1519 Juniper JUNOS: Mehrere Schwachstellen ermöglichen Privilegieneskalation BSI CERT-Bund (WID) · Oct 9, 2025
References
- https://datatracker.ietf.org/doc/html/rfc2865
- https://datatracker.ietf.org/doc/draft-ietf-radext-deprecating-radius/
- https://networkradius.com/assets/pdf/radius_and_md5_collisions.pdf
- https://www.blastradius.fail/
- http://www.openwall.com/lists/oss-security/2024/07/09/4
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0014
- Siemens Security Advisory by Siemens ProductCERT for SIPROTEC, SICAM and related product vendor-advisory
- Siemens Security Advisory by Siemens ProductCERT to SCALANCE, RUGGEDCOM and related products. vendor-advisory