PVS-Studio warning V557 for WebRTC

#define MAX_CCMS 4

ccm_cfg_t   ccm[MAX_CCMS];

var_t prot_cfg_table[CFGID_PROTOCOL_MAX+1] = {
  ....
  {"ccmSrstIpAddr",   CFGVAR(ccm[4].address), PA_STR, PR_STR, 0},
  {"ccmSrst_sipPort", CFGVAR(ccm[4].sip_port),PA_INT, PR_INT, 0},
  {"ccmSrst_isValid", CFGVAR(ccm[4].is_valid),PA_INT, PR_INT, 0},
  {"ccmSrst_securityLevel",
                    CFGVAR(ccm[4].sec_level), PA_INT, PR_INT, 0},
  ....
};

This suspicious code was found in WebRTC project by PVS-Studio static code analyzer.
Warning message is:
V557 Array overrun is possible. The '4' index is pointing beyond array bound. prot_cfgmgr_private.h 357

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/