CVE-2015-7602: Directory traversal vulnerability in BisonWare BisonFTP 3.5 allows remote attackers to read arbitrary files vi

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HIGH 7.8DOWNGRADE

CVE-2015-7602 is a high-severity flaw (CVSS 7.8) affecting bisonftp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Directory traversal vulnerability in BisonWare BisonFTP 3.5 allows remote attackers to read arbitrary files via a ../ (dot dot slash) in a RETR command.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	61.5% (top 1%)
CISA exploited list	No
Weakness	CWE-22
Published	2015-09-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: bisonware

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

Am I affected?

Timeline

2015-09-29 19:59 UTCPublished CVE record published
2026-06-17 00:32 UTCUpdated Record last modified

bisonware bisonftp DOWNGRADE

Affected: 3.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.5 (Debian / Ubuntu)

apt-cache madison bisonftp sudo apt install bisonftp=<VERSION_BEFORE_3.5> sudo apt-mark hold bisonftp

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list bisonftp sudo dnf downgrade bisonftp-<VERSION_BEFORE_3.5> sudo dnf versionlock add bisonftp

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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: BisonWare BisonFTP Server 3.5 - Directory Traversal
Metasploit: BisonWare BisonFTP Server 3.5 Directory Traversal Information Disclosure

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-2015-7602?

bisonftp: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-7602 being exploited?

CVE-2015-7602 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-2015-7602 affect?

CVE-2015-7602 affects bisonftp. Severity is high (CVSS 7.8). Directory traversal vulnerability in BisonWare BisonFTP 3.5 allows remote attackers to read arbitrary files via a ../ (dot dot slash) in a RETR command.

How urgent is CVE-2015-7602?

Priority 57/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference

References

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