CVE-2005-2640: n/a vulnerability

CVE-2005-2640: Behavioral discrepancy information leak in Juniper Netscreen VPN running ScreenOS 5.2.0 and earlier, when u...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 22:45 UTC (UTC+00:00)

Security readout for executives and security teams

This issue lets an unauthenticated remote party tell whether a VPN username exists on affected Juniper NetScreen VPNs. It does not by itself provide access, but it can reduce the effort needed for password attacks, phishing, or targeted VPN compromise attempts. Exposure is most likely where legacy Juniper NetScreen VPN endpoints run ScreenOS 5.2.0 or earlier and accept IKE Aggressive Mode with pre-shared key authentication from untrusted networks. Treat this as a legacy VPN exposure issue. It is not documented here as active exploitation or direct compromise, but it can aid targeted attacks against remote access infrastructure. Mitigation focus: Identify any Juniper NetScreen VPNs running ScreenOS 5.2.0 or earlier.; Check Juniper guidance for fixed releases or supported configuration changes.; Disable IKE Aggressive Mode with pre-shared keys where business requirements allow..

Prepared: Jun 29, 2026, 18:15 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Aug 20, 2005, 04:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

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1Source links

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No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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