CVE-2023-4279Public exploitNetwork attack vector

Audit-log source spoofing via trusted Client-Ip header

Published Sep 4, 2023 · Updated Apr 23, 2025

IP address spoofing in Solwin Infotech User Activity Log before 1.6.7 allows remote attackers to falsify source addresses in audit logs. When IP logging is enabled, the client-address lookup trusts an attacker-controlled Client-Ip HTTP header and records its supplied value. An unauthenticated request can therefore obscure its traffic origin in the plugin's audit trail, without granting access to protected resources.

CVSS severity7.5
High
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

IP address spoofing in Solwin Infotech User Activity Log before 1.6.7 allows remote attackers to falsify source addresses in audit logs. When IP logging is enabled, the client-address lookup trusts an attacker-controlled Client-Ip HTTP header and records its supplied value. An unauthenticated request can therefore obscure its traffic origin in the plugin's audit trail, without granting access to protected resources.

The record

CVE
CVE-2023-4279
Published
Sep 4, 2023
Updated
Apr 23, 2025
Vendor
Solwin Infotech
Product
User Activity Log
Classifications
CWE-290
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=0 <1.6.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Solwin Infotech · User Activity Logversion=0 <1.6.7

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing

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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