CVE-2026-81939Network attack vector

Arbitrary file write via archive path traversal

Published Sep 4, 2026 · Updated Sep 4, 2026

Path traversal in SonicWall Network Security Manager 4.3.0 and earlier allows remote authenticated users to write files outside its archive directory. The On-Prem archive processor accepts traversal sequences in entry paths and extracts those entries without confining the resolved path to its destination. A privileged user must reach the file-upload workflow and submit a crafted archive; the resulting arbitrary file write can alter host files.

CVSS severity8.6
High
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in SonicWall Network Security Manager 4.3.0 and earlier allows remote authenticated users to write files outside its archive directory. The On-Prem archive processor accepts traversal sequences in entry paths and extracts those entries without confining the resolved path to its destination. A privileged user must reach the file-upload workflow and submit a crafted archive; the resulting arbitrary file write can alter host files.

The record

CVE
CVE-2026-81939
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
SonicWall
Product
Network Security Manager
Classifications
CWE-22, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record 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=4.3.0 and earlier versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

SonicWall · Network Security Managerversion=4.3.0 and earlier versions

Published CVSS scores

8.6SonicWall PSIRTCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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