CVE-2001-0681: Buffer overflow in ftpd in QPC QVT/Net 5.0 and QVT/Term 5.0 allows a remote attacker to cause a denial of serv

Routine

MEDIUM 5.0DOWNGRADEDOWNGRADE

CVE-2001-0681 is a medium-severity flaw (CVSS 5.0) affecting qvt net, qvt term. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in ftpd in QPC QVT/Net 5.0 and QVT/Term 5.0 allows a remote attacker to cause a denial of service via a long (1) username or (2) password.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Published	2001-09-20
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: qpc software

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

Am I affected?

Timeline

2001-09-20 04:00 UTCPublished CVE record published
2026-06-16 21:54 UTCUpdated Record last modified

qpc software qvt net DOWNGRADE

Affected: 5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

1. Check installed version

apt-cache policy qvt-net || rpm -q qvt-net || qvt-net --version

2. No fixed release: DOWNGRADE to a release before 5.0 (Debian / Ubuntu)

apt-cache madison qvt-net sudo apt install qvt-net=<VERSION_BEFORE_5.0> sudo apt-mark hold qvt-net

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

dnf --showduplicates list qvt-net sudo dnf downgrade qvt-net-<VERSION_BEFORE_5.0> sudo dnf versionlock add qvt-net

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.

qpc software qvt term DOWNGRADE

Affected: 5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

1. Check installed version

apt-cache policy qvt-term || rpm -q qvt-term || qvt-term --version

2. No fixed release: DOWNGRADE to a release before 5.0 (Debian / Ubuntu)

apt-cache madison qvt-term sudo apt install qvt-term=<VERSION_BEFORE_5.0> sudo apt-mark hold qvt-term

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

dnf --showduplicates list qvt-term sudo dnf downgrade qvt-term-<VERSION_BEFORE_5.0> sudo dnf versionlock add qvt-term

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-2001-0681?

qvt net: downgrade or apply the listed mitigation; qvt term: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2001-0681 being exploited?

CVE-2001-0681 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-2001-0681 affect?

CVE-2001-0681 affects qvt net, qvt term. Severity is medium (CVSS 5.0). Buffer overflow in ftpd in QPC QVT/Net 5.0 and QVT/Term 5.0 allows a remote attacker to cause a denial of service via a long (1) username or (2) password.

How urgent is CVE-2001-0681?

Priority 35/100. No elevated risk signals yet.

Related CVEs

CVE-2001-0680 MEDIUM 5.0 DOWNGRADE DOWNGRADE Directory traversal vulnerability in ftpd in QPC QVT/Net 4.0 and AVT/Term 5.0 allows a remote attacker to trav
CVE-2001-0443 HIGH 7.5 DOWNGRADE DOWNGRADE Buffer overflow in QPC QVT/Net Popd 4.20 in QVT/Net 5.0 allows remote attackers to cause a denial of service,

References

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