CVE-2016-5725: Directory traversal vulnerability in JCraft JSch before 0.1.54 on Windows, when the mode is ChannelSftp.OVERWR

Q: How do I fix CVE-2016-5725?

jsch: upgrade to newer than 0.1.53. Exact commands for each OS are on this page.

Q: Is CVE-2016-5725 being exploited?

CVE-2016-5725 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2016-5725 affect?

CVE-2016-5725 affects jsch. Severity is medium (CVSS 5.9). Directory traversal vulnerability in JCraft JSch before 0.1.54 on Windows, when the mode is ChannelSftp.OVERWRITE, allows remote SFTP servers to write to arbitrary files via a ..\ (dot dot backslash) in a response to a recursive GET command

Q: How urgent is CVE-2016-5725?

Priority 55/100. EPSS top 2%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.9REMOTEUPGRADE

CVE-2016-5725 is a medium-severity flaw (CVSS 5.9) affecting jsch. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Directory traversal vulnerability in JCraft JSch before 0.1.54 on Windows, when the mode is ChannelSftp.OVERWRITE, allows remote SFTP servers to write to arbitrary files via a ..\ (dot dot backslash) in a response to a recursive GET command.

Why this priority

EPSS top 2%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	24.1% (top 2%)
CISA exploited list	No
Weakness	CWE-22
Published	2017-01-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jcraft

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-01-19 22:59 UTCPublished CVE record published
2026-06-17 00:49 UTCUpdated Record last modified

jcraft jsch UPGRADE

Affected: <= 0.1.53

Fixed in: newer than 0.1.53

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jsch || rpm -q jsch || jsch --version

2. UPGRADE to newer than 0.1.53 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jsch

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jsch

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: JCraft/JSch Java Secure Channel 0.1.53 - Recursive sftp-get Directory Traversal

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2016-5725?

jsch: upgrade to newer than 0.1.53. Exact commands for each OS are on this page.

Is CVE-2016-5725 being exploited?

CVE-2016-5725 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2016-5725 affect?

CVE-2016-5725 affects jsch. Severity is medium (CVSS 5.9). Directory traversal vulnerability in JCraft JSch before 0.1.54 on Windows, when the mode is ChannelSftp.OVERWRITE, allows remote SFTP servers to write to arbitrary files via a ..\ (dot dot backslash) in a response to a recursive GET command

How urgent is CVE-2016-5725?

Priority 55/100. EPSS top 2%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Windows vulnerabilities

References

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