CVE-2023-43177Public exploitNetwork attack vector

Unauthenticated administrator takeover via AS2 header clobbering

Published Nov 17, 2023 · Updated Sep 4, 2024

Mass assignment in CrushFTP before 10.5.1 allows remote attackers to hijack user sessions and obtain administrator access. ServerSessionAJAX.java's buildPostItem() copies every request header from as2Info into the session's user_info Properties with putAll(), allowing an AS2-To request to overwrite trusted session attributes. An exposed web interface is sufficient; exploitation begins with an anonymous pseudo-session and can expose files and plaintext passwords or enable arbitrary command execution.

CVSS severity9.8
Critical
EPSS probability81.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Mass assignment in CrushFTP before 10.5.1 allows remote attackers to hijack user sessions and obtain administrator access. ServerSessionAJAX.java's buildPostItem() copies every request header from as2Info into the session's user_info Properties with putAll(), allowing an AS2-To request to overwrite trusted session attributes. An exposed web interface is sufficient; exploitation begins with an anonymous pseudo-session and can expose files and plaintext passwords or enable arbitrary command execution.

The record

CVE
CVE-2023-43177
Published
Nov 17, 2023
Updated
Sep 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-915, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8Rapid7CVSS:3.1/AV:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-915Improperly Controlled Modification of Dynamically-Determined Object Attributes
T1190Exploit Public-Facing Application

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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