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RFC 1939 http://tools.ietf.org/html/rfc1939

The Post Office Protocol version 3 (POP3) is intended to permit a workstation to dynamically access a maildrop on a server host. It is usually used to allow a workstation to retrieve mail that the server is holding for it.

POP3 transmissions appear as data messages between stations. The messages are either command or reply messages.

Vulnerabilities for this protocol (from CVE)

CVE ID Protocol Source Port Targetport
CVE-1999-0822tcpany110
Description: Post Office Protocol version 3

TCP/IP Protocols:

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