CVE-2023-41717Public exploit

File-transfer restriction bypass via chunked requests

Published Aug 31, 2023 · Updated Oct 1, 2024

Inappropriate file-type control in Zscaler Proxy 3.6.1.25 and earlier allows local users to bypass upload and download restrictions. The proxy does not reconstruct files split across HTTP Range requests, so chunked password-protected archives evade file-type inspection. A low-privileged Windows user can issue repeated partial-content requests manually or through BITS and reassemble a prohibited file without changing proxy policy.

CVSS severity5.5
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Inappropriate file-type control in Zscaler Proxy 3.6.1.25 and earlier allows local users to bypass upload and download restrictions. The proxy does not reconstruct files split across HTTP Range requests, so chunked password-protected archives evade file-type inspection. A low-privileged Windows user can issue repeated partial-content requests manually or through BITS and reassemble a prohibited file without changing proxy policy.

The record

CVE
CVE-2023-41717
Published
Aug 31, 2023
Updated
Oct 1, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-552, T1197
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 31, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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 vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-552Files or Directories Accessible to External Parties
T1197BITS Jobs

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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