Drop everything.
Critical CVEs that are confirmed exploited or very likely to be. Newest first.
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CVE-2001-0538
Microsoft Outlook View ActiveX Control in Microsoft Outlook 2002 and earlier allows remote attackers to execute arbitrary commands via a malicious HTML e-mail message or web page.
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CVE-2001-0499
Buffer overflow in Transparent Network Substrate (TNS) Listener in Oracle 8i 8.1.7 and earlier allows remote attackers to gain privileges via a long argument to the commands (1) STATUS, (2) PING, (3) SERVICES, (4) TRC_FILE, (5) SAVE_CONFIG, or (6) RELOAD.
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CVE-2001-0500
Buffer overflow in ISAPI extension (idq.dll) in Index Server 2.0 and Indexing Service 2000 in IIS 6.0 beta and earlier allows remote attackers to execute arbitrary commands via a long argument to Internet Data Administration (.ida) and Internet Data Query (.idq) files such as default.ida, as commonly exploited by Code Red.
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CVE-2001-0537
HTTP server for Cisco IOS 11.3 to 12.2 allows attackers to bypass authentication and execute arbitrary commands, when local authorization is being used, by specifying a high access level in the URL.
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CVE-2001-0241
Buffer overflow in Internet Printing ISAPI extension in Windows 2000 allows remote attackers to gain root privileges via a long print request that is passed to the extension through IIS 5.0.
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CVE-2001-0414
Buffer overflow in ntpd ntp daemon 4.0.99k and earlier (aka xntpd and xntp3) allows remote attackers to cause a denial of service and possibly execute arbitrary commands via a long readvar argument.
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CVE-2001-0168
Buffer overflow in AT&T WinVNC (Virtual Network Computing) server 3.3.3r7 and earlier allows remote attackers to execute arbitrary commands via a long HTTP GET request when the DebugLevel registry key is greater than 0.
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CVE-2001-0236
Buffer overflow in Solaris snmpXdmid SNMP to DMI mapper daemon allows remote attackers to execute arbitrary commands via a long "indication" event.
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CVE-2001-0098
Buffer overflow in Bea WebLogic Server before 5.1.0 allows remote attackers to execute arbitrary commands via a long URL that begins with a ".." string.
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CVE-2000-1089
Buffer overflow in Microsoft Phone Book Service allows local users to execute arbitrary commands, aka the "Phone Book Service Buffer Overflow" vulnerability.
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CVE-2000-0917
Format string vulnerability in use_syslog() function in LPRng 3.6.24 allows remote attackers to execute arbitrary commands.
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CVE-2000-0945
The web configuration interface for Catalyst 3500 XL switches allows remote attackers to execute arbitrary commands without authentication when the enable password is not set, via a URL containing the /exec/ directory.
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CVE-2000-0681
Buffer overflow in BEA WebLogic server proxy plugin allows remote attackers to execute arbitrary commands via a long URL with a .JSP extension.
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CVE-2000-0573
The lreply function in wu-ftpd 2.6.0 and earlier does not properly cleanse an untrusted format string, which allows remote attackers to execute arbitrary commands via the SITE EXEC command.
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CVE-2000-0248
The web GUI for the Linux Virtual Server (LVS) software in the Red Hat Linux Piranha package has a backdoor password that allows remote attackers to execute arbitrary commands.
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CVE-2000-0322
The passwd.php3 CGI script in the Red Hat Piranha Virtual Server Package allows local users to execute arbitrary commands via shell metacharacters.
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CVE-1999-1011
The Remote Data Service (RDS) DataFactory component of Microsoft Data Access Components (MDAC) in IIS 3.x and 4.x exposes unsafe methods, which allows remote attackers to execute arbitrary commands.
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CVE-1999-0874
Buffer overflow in IIS 4.0 allows remote attackers to cause a denial of service via a malformed request for files with .HTR, .IDC, or .STM extensions.
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CVE-1999-0661
A system is running a version of software that was replaced with a Trojan Horse at one of its distribution points, such as (1) TCP Wrappers 7.6, (2) util-linux 2.9g, (3) wuarchive ftpd (wuftpd) 2.2 and 2.1f, (4) IRC client (ircII) ircII 2.2.9, (5) OpenSSH 3.4p1, or (6) Sendmail 8.12.6.
A CVE is listed as major when it is critical (CVSS 9.0 or higher) and either confirmed exploited in the wild with a real chance of more, or very likely to be exploited (EPSS 40% or more).