CVE-2005-2640
Behavioral discrepancy information leak in Juniper Netscreen VPN running ScreenOS 5.2.0 and...
CVE-2005-2640 is a medium vulnerability (CVSS 5.0) in Juniper Netscreen-5gt, published August 20, 2005. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 7.09%, the 94th percentile. No source names a fixed version.
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2005-2640- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2005-2640- Updated
- 2026-11-02
EUVDEUVD-2005-2641 No score
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.
- Record
EUVD-2005-2641- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-8h6v-vg4c-567j No score
Behavioral discrepancy information leak in Juniper Netscreen VPN running ScreenOS 5.2.0 and...
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.
- Record
GHSA-8h6v-vg4c-567j- Updated
- 2026-11-02
Affected products
- juniper netscreen-5gt
- juniper netscreen-idp
- juniper netscreen-idp 10
- juniper netscreen-idp 100
- juniper netscreen-idp 1000
- juniper netscreen-idp 500
- juniper netscreen screenos
- neoteris instant virtual extranet
- netscreen netscreen-sa 5000 series
- netscreen netscreen-sa 5020 series
- netscreen netscreen-sa 5050 series
- netscreen ns-10
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Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Juniper NetScreen 5.0 - VPN 'Username' Enumeration | 2005-08-18 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, Exploit-DB, GitHub Advisories, NVD |