CVE-2008-1618

The PPTP VPN service in Watchguard Firebox before 10, when performing the MS-CHAPv2 authentication handshake, generates different error codes depending on whether the username is valid or invalid, which allows remote attackers to enumerate valid usernames.

• CWE-200

• http://secunia.com/advisories/29708Vendor Advisory
• http://www.mwrinfosecurity.com/publications/mwri_watchguard-firebox-pptp-vpn-user-enumeration-advisory_2008-04-04.pdfExploit, Patch
• http://www.osvdb.org/44218
• http://www.securityfocus.com/bid/28619
• http://www.securitytracker.com/id?1019796
• http://www.vupen.com/english/advisories/2008/1152/referencesVendor Advisory
• https://exchange.xforce.ibmcloud.com/vulnerabilities/41683
• http://secunia.com/advisories/29708Vendor Advisory
• http://www.mwrinfosecurity.com/publications/mwri_watchguard-firebox-pptp-vpn-user-enumeration-advisory_2008-04-04.pdfExploit, Patch
• http://www.osvdb.org/44218
• http://www.securityfocus.com/bid/28619
• http://www.securitytracker.com/id?1019796
• http://www.vupen.com/english/advisories/2008/1152/referencesVendor Advisory
• https://exchange.xforce.ibmcloud.com/vulnerabilities/41683

Published

Apr 7, 2008

Last Modified

Jun 16, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2008-1611Stack-based buffer overflow in TFTP Server SP 1.4 for Window…
• CVE-2008-1612The arrayShrink function (lib/Array.c) in Squid 2.6.STABLE17…
• CVE-2008-1613SQL injection vulnerability in ioRD.asp in RedDot CMS 7.5 Bu…
• CVE-2008-1614suPHP before 0.6.3 allows local users to gain privileges via…
• CVE-2008-1615Linux kernel 2.6.18, and possibly other versions, when runni…
• CVE-2008-1617Double free vulnerability in Web TransferCtrl Class 8,2,1,4 …
• CVE-2008-1619The ssm_i emulation in Xen 5.1 on IA64 architectures allows …
• CVE-2008-1620Directory traversal vulnerability in 2X TFTP service (TFTPd.…
• CVE-2008-1621Multiple cross-site scripting (XSS) vulnerabilities in GeeCa…
• CVE-2008-1622Multiple PHP remote file inclusion vulnerabilities in GeeCar…
• CVE-2008-1623SQL injection vulnerability in admin_view_image.php in Smoot…
• CVE-2008-1624Directory traversal vulnerability in v2demo/page.php in Jsho…