CVE-2020-1616Network attack vector

Password brute forcing via unenforced login attempt limit

Published Apr 8, 2020 · Updated Sep 17, 2024

Login-attempt restriction failure in Juniper Advanced Threat Prevention Appliance before 5.0.6.0 allows remote attackers to brute-force SSH passwords. The SSH login service fails to enforce its configured server-side attempt limit, so a source can continue submitting password guesses. Network access to SSH is sufficient; repeated guesses can identify a valid password, with no reported data alteration or service interruption.

CVSS severity5.3
Medium
EPSS probability1.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Login-attempt restriction failure in Juniper Advanced Threat Prevention Appliance before 5.0.6.0 allows remote attackers to brute-force SSH passwords. The SSH login service fails to enforce its configured server-side attempt limit, so a source can continue submitting password guesses. Network access to SSH is sufficient; repeated guesses can identify a valid password, with no reported data alteration or service interruption.

The record

CVE
CVE-2020-1616
Published
Apr 8, 2020
Updated
Sep 17, 2024
Vendor
Juniper Networks
Product
Juniper Advanced Threat Prevention Appliance
Classifications
CWE-307, T1110
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <5.0.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Juniper Advanced Threat Prevention Applianceversion=unspecified <5.0.6.0

Published CVSS scores

5.0NISTAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3Juniper Networks, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
T1110Brute Force

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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