CVE-2022-4724Public exploit

Account impersonation via duplicate SSH key fingerprints

Published Dec 23, 2022 · Updated Apr 9, 2025

Improper access control in IKUS Software Rdiffweb before 2.5.5 allows local users to authenticate as another user through a shared SSH key. The SSH-key model stores each key's fingerprint without a database-wide uniqueness constraint, so one fingerprint can resolve to more than one Rdiffweb user. Exploitation requires the matching private key and duplicate registration of its public key; successful use grants the repositories and permissions of the other mapped account.

CVSS severity8.4
High
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in IKUS Software Rdiffweb before 2.5.5 allows local users to authenticate as another user through a shared SSH key. The SSH-key model stores each key's fingerprint without a database-wide uniqueness constraint, so one fingerprint can resolve to more than one Rdiffweb user. Exploitation requires the matching private key and duplicate registration of its public key; successful use grants the repositories and permissions of the other mapped account.

The record

CVE
CVE-2022-4724
Published
Dec 23, 2022
Updated
Apr 9, 2025
Vendor
IKUS Software
Product
Rdiffweb
Classifications
CWE-284, T1078
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 23, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2025Record 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 <2.5.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

IKUS Software · Rdiffwebversion=unspecified <2.5.5

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.4huntr.devCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
T1078Valid Accounts

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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