CVE-2022-4723Public exploitNetwork attack vector

Service interruption via unlimited MFA email resends

Published Dec 23, 2022 · Updated Apr 9, 2025

Resource exhaustion in IKUS Software Rdiffweb before 2.5.5 allows remote authenticated users to interrupt service via repeated MFA email resends. PagePrefMfa.default accepts POST requests at /prefs/mfa without the rate-limit decorator, allowing each resend action to dispatch another message. Repeated requests consume application and mail-delivery resources; the path requires an authenticated account and enabled email-based MFA.

CVSS severity7.1
High
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in IKUS Software Rdiffweb before 2.5.5 allows remote authenticated users to interrupt service via repeated MFA email resends. PagePrefMfa.default accepts POST requests at /prefs/mfa without the rate-limit decorator, allowing each resend action to dispatch another message. Repeated requests consume application and mail-delivery resources; the path requires an authenticated account and enabled email-based MFA.

The record

CVE
CVE-2022-4723
Published
Dec 23, 2022
Updated
Apr 9, 2025
Vendor
IKUS Software
Product
Rdiffweb
Classifications
CWE-770, T1499.003
Attack vector
network
Privileges
authenticated

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 vectornetwork
Required privilegesauthenticated

What is affected?

IKUS Software · Rdiffwebversion=unspecified <2.5.5

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.3huntr.devCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H
7.1GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.003Application Exhaustion Flood

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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