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RFC 2138 http://tools.ietf.org/html/rfc2138
RFC 2139 http://tools.ietf.org/html/rfc2139

Radius is a protocol which manages dispersed serial line and modem pools for large numbers of users.
(Compliant with IETF RFC2138 and RFC2139.)

The format of the header is shown in the following illustration:

8
16
32 bits

Code

Identifier

Length


Authenticator
(16 bytes)
 

Radius header structure

Code
The message type.

Identifier
The identifier matches requests and replies.

Length
The message length including the header.

Authenticator
A field used to authenticate the reply from the radius server and in the password hiding algorithm.

Vulnerabilities for this protocol (from CVE)

CVE ID Protocol Source Port Targetport
CVE-2000-0542tcpany1812
Description: Tigris remote access server before 11.5.4.22 does not properly record Radius accounting information when a user fails the initial login authentication but subsequently succeeds.
CVE-1999-0244tcpany1812
Description: Livingston RADIUS code has a buffer overflow which can allow remote execution of commands as root.

TCP/IP Protocols:

AHARP/RARPATMPBGP-4COPSDCAPDHCPDNS
DVMRPEGPEIGRPESPFANPFingerFTPHSRP
HTTPICMPICMPv6IGMPIGRPIMAP4IPIPDC
IPv6ISAKMPL2FL2TPLDAPMARSMobile IPNARP
NetBIOS/IPNHRPNTPOSPFPIMPOP3PPTPRadius
RIP2RIPng for IPv6RLOGINRSVPRTSPRUDPS-HTTPSCTP
SLPSMTPSNMPSOCKS V5TACACSTALITCPTELNET
TFTPUDPVan JacobsonVRRPWCCPX-WindowXOT