CVE-2020-26299Public exploitNetwork attack vector

Authenticated root escape via backslash path resolution

Published Feb 10, 2021 · Updated Aug 4, 2024

Path traversal in Autovance ftp-srv before 4.4.0 allows remote authenticated users to escape their FTP root on Windows servers. The FileSystem._resolvePath method passes backslash-containing client paths through path.resolve without first normalizing Windows separators, leaving parent-directory segments effective. A valid FTP session and a Windows host are required; CWD or UPDR paths containing backslash traversal sequences can reach files and directories outside the assigned root.

CVSS severity6.3
Medium
EPSS probability1.86%
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 Autovance ftp-srv before 4.4.0 allows remote authenticated users to escape their FTP root on Windows servers. The FileSystem._resolvePath method passes backslash-containing client paths through path.resolve without first normalizing Windows separators, leaving parent-directory segments effective. A valid FTP session and a Windows host are required; CWD or UPDR paths containing backslash traversal sequences can reach files and directories outside the assigned root.

The record

CVE
CVE-2020-26299
Published
Feb 10, 2021
Updated
Aug 4, 2024
Vendor
Autovance
Product
ftp-srv
Classifications
CWE-22, T1083
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 10, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Autovance · ftp-srvversion=< 4.4.0

Published CVSS scores

6.3GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
5.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:N
9.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1083File and Directory Discovery

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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