CVE-2024-40457Public exploit

Credential disclosure via cleartext arguments and files

Published Sep 12, 2024 · Updated Oct 31, 2024

Cleartext credential exposure in No-IP Dynamic Update Client 3.x allows local users to read DDNS credentials from process arguments or a file. The Linux client accepts username and password options, while its startup guide places NOIP_USERNAME and NOIP_PASSWORD in /etc/default/noip-duc. Exposure requires local access to process metadata or the file; No-IP states that file-based cleartext storage is intentional, so the record is disputed.

CVSS severity9.1
Critical
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext credential exposure in No-IP Dynamic Update Client 3.x allows local users to read DDNS credentials from process arguments or a file. The Linux client accepts username and password options, while its startup guide places NOIP_USERNAME and NOIP_PASSWORD in /etc/default/noip-duc. Exposure requires local access to process metadata or the file; No-IP states that file-based cleartext storage is intentional, so the record is disputed.

The record

CVE
CVE-2024-40457
Published
Sep 12, 2024
Updated
Oct 31, 2024
Vendor
No-IP
Product
Dynamic Update Client (DUC)
Classifications
CWE-312, T1552.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 31, 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=3.x

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

No-IP · Dynamic Update Client (DUC)version=3.x

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

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.

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No observations available

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

Weakness, pattern, technique

CWE-312Cleartext Storage of Sensitive Information
T1552.001Credentials In Files

Public exploit references

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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