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CVE-2005-2640

5.0 · MEDIUM

Behavioral discrepancy information leak in Juniper Netscreen VPN running ScreenOS 5.2.0 and earlier, when using IKE with pre-shared key authentication, allows remote attackers to enumerate valid us…

Published Aug 23, 2005neoterisEPSS 7.09%

Overview

CVE-2005-2640 is a medium-severity vulnerability affecting neoteris instant_virtual_extranet. It was published on August 23, 2005 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Behavioral discrepancy information leak in Juniper Netscreen VPN running ScreenOS 5.2.0 and earlier, when using IKE with pre-shared key authentication, allows remote attackers to enumerate valid usernames via an IKE Aggressive Mode packet, which generates a response if the username is valid but does not respond when the username is invalid.

Remediation

Check the references section for vendor advisories and patches from neoteris. Update instant_virtual_extranet to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refmarc.info/?l=bugtraq&m=112438068426034&w=2Refsecunia.com/advisories/16474/Refsecuritytracker.com/id?1014728Refwww.nta-monitor.com/news/vpn-flaws/juniper/netscreen/index.htmRefwww.securityfocus.com/bid/14595Refmarc.info/?l=bugtraq&m=112438068426034&w=2Refsecunia.com/advisories/16474/Refsecuritytracker.com/id?1014728Refwww.nta-monitor.com/news/vpn-flaws/juniper/netscreen/index.htmRefwww.securityfocus.com/bid/14595

How CyberStrike helps

Frequently asked questions

What is CVE-2005-2640?

CVE-2005-2640 is a medium-severity vulnerability affecting neoteris instant_virtual_extranet. It was published on August 23, 2005 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

How severe is CVE-2005-2640?

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2005-2640?

Check the references section for vendor advisories and patches from neoteris. Update instant_virtual_extranet to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2005-2640?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2005-2640 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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