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CVE-2005-2640· NVD / CVE Program· CNA mitre

Behavioral discrepancy information leak in Juniper Netscreen VPN running ScreenOS 5.2.0 and earlier, when using IKE with pre-shared key auth

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.

MediumCVSS 5.0 · v2.0—Proof of concept No fix recorded
Published
Aug 23, 2005
Updated
Jun 16, 2026
EPSS
7.1% · 94th percentile
CWE
—
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Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
20 / 40 · 5.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 7.1%

Affected systems

VendorProduct
junipernetscreen screenos
junipernetscreen-5gt
junipernetscreen-idp
junipernetscreen-idp 10
junipernetscreen-idp 100
junipernetscreen-idp 1000
junipernetscreen-idp 500
neoterisinstant virtual extranet
netscreenns-10
netscreenns-100
netscreenns-204
netscreenns-500

and 4 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • juniper netscreen screenos1.64
  • juniper netscreen screenos1.66
  • juniper netscreen screenos1.66_r2
  • juniper netscreen screenos1.7
  • juniper netscreen screenos1.73_r1
  • juniper netscreen screenos1.73_r2
  • juniper netscreen screenos2.0.1_r8
  • juniper netscreen screenos2.1
  • juniper netscreen screenos2.1_r6
  • juniper netscreen screenos2.1_r7
  • juniper netscreen screenos2.10_r3
  • juniper netscreen screenos2.10_r4
  • juniper netscreen screenos2.5
  • juniper netscreen screenos2.5r1
  • juniper netscreen screenos2.5r2
  • juniper netscreen screenos2.5r6
  • juniper netscreen screenos2.6.0
  • juniper netscreen screenos2.6.1
  • juniper netscreen screenos2.6.1r1
  • juniper netscreen screenos2.6.1r10

Same product

juniper: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-0059ScreenOS: Stored Cross-Site Scripting (XSS) vulnerability
    21Monitor
  • CVE-2004-1446Unknown vulnerability in ScreenOS in Juniper Networks NetScreen firewall 3.x through 5.x allows remote attackers to cause a denial of servic
    21Monitor
  • CVE-2002-1547Netscreen running ScreenOS 4.0.0r6 and earlier allows remote attackers to cause a denial of service via a malformed SSH packet to the Secure
    21Monitor
  • CVE-2002-2150Firewalls from multiple vendors empty state tables more slowly than they are filled, which allows remote attackers to flood state tables wit
    21Monitor
  • CVE-2002-0891The web interface (WebUI) of NetScreen ScreenOS before 2.6.1r8, and certain 2.8.x and 3.0.x versions before 3.0.3r1, allows remote attackers
    20Monitor
  • CVE-2008-6096Cross-site scripting (XSS) vulnerability in Juniper NetScreen ScreenOS before 5.4r10, 6.0r6, and 6.1r2 allows remote attackers to inject arb
    17Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entryremote2005-08-18

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-5 d
  2. Published
  3. TodaySep 30, 2026+7709 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • No special conditions are required; it is repeatable.

If successful

Confidentiality
P · data can be read
Integrity
none
Availability
none
Attack complexity
Low
Confidentiality impact
P
Integrity impact
None
Availability impact
None

Weakness class (CWE)

—

CVSS vector

AV:N/AC:L/Au:N/C:P/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records