CVE-2007-1654: Buffer overflow in the Ne7sshSftp::addOpenHandle function in ne7ssh_sftp.cpp in NetSieben SSH Library (ne7ssh)

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HIGH 9.3DOWNGRADE

CVE-2007-1654 is a high-severity flaw (CVSS 9.3) affecting netsieben ssh library. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in the Ne7sshSftp::addOpenHandle function in ne7ssh_sftp.cpp in NetSieben SSH Library (ne7ssh) before 1.2.1 allows user-assisted remote SFTP servers to cause a denial of service (crash) or possibly execute arbitrary code via multiple file transfers, related to multiple open file handles in SFTP (1) put and (2) get operations.

Why this priority

Critical severity

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

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Published	2007-03-24
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: netsieben

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2007-03-24 00:19 UTCPublished CVE record published
2026-06-16 22:38 UTCUpdated Record last modified

netsieben netsieben ssh library DOWNGRADE

Affected: 1.1 · 1.1.5 · 1.1.6 · 1.2.0 · 1.03

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1

1. Check installed version

apt-cache policy netsieben-ssh-library || rpm -q netsieben-ssh-library || netsieben-ssh-library --version

2. No fixed release: DOWNGRADE to a release before 1.1 (Debian / Ubuntu)

apt-cache madison netsieben-ssh-library sudo apt install netsieben-ssh-library=<VERSION_BEFORE_1.1> sudo apt-mark hold netsieben-ssh-library

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

dnf --showduplicates list netsieben-ssh-library sudo dnf downgrade netsieben-ssh-library-<VERSION_BEFORE_1.1> sudo dnf versionlock add netsieben-ssh-library

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.

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-2007-1654?

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

Is CVE-2007-1654 being exploited?

CVE-2007-1654 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-2007-1654 affect?

CVE-2007-1654 affects netsieben ssh library. Severity is high (CVSS 9.3). Buffer overflow in the Ne7sshSftp::addOpenHandle function in ne7ssh_sftp.cpp in NetSieben SSH Library (ne7ssh) before 1.2.1 allows user-assisted remote SFTP servers to cause a denial of service (crash) or possibly execute arbitrary code via

How urgent is CVE-2007-1654?

Priority 54/100. Critical severity

References

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