CVE-2022-4721Network attack vector

Phishing redirection via unsanitized SSH key names

Published Dec 23, 2022 · Updated Apr 9, 2025

Link injection in IKUS Software Rdiffweb before 2.5.5 allows remote attackers to redirect email recipients through crafted SSH key names. Notification email templates emit attacker-controlled SSH key names as plain text that mail clients automatically convert into clickable hyperlinks. Exploitation requires a recipient to open the generated email and follow the injected link, limiting the consequence to phishing-driven redirection.

CVSS severity5.3
Medium
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Link injection in IKUS Software Rdiffweb before 2.5.5 allows remote attackers to redirect email recipients through crafted SSH key names. Notification email templates emit attacker-controlled SSH key names as plain text that mail clients automatically convert into clickable hyperlinks. Exploitation requires a recipient to open the generated email and follow the injected link, limiting the consequence to phishing-driven redirection.

The record

CVE
CVE-2022-4721
Published
Dec 23, 2022
Updated
Apr 9, 2025
Vendor
IKUS Software
Product
Rdiffweb
Classifications
CWE-75, T1566.002
Attack vector
network
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 vectornetwork
Required privilegesunauthenticated

What is affected?

IKUS Software · Rdiffwebversion=unspecified <2.5.5

Published CVSS scores

5.3GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
5.4GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/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-75Failure to Sanitize Special Elements into a Different Plane (Special Element Injection)
T1566.002Phishing: Spearphishing Link

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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