CVE-2018-6461: March Hare WINCVS before 2.8.01 build 6610, and CVS Suite before 2009R2 build 6610, contains an Insecure Libra

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HIGH 7.8UPGRADE

CVE-2018-6461 is a high-severity flaw (CVSS 7.8) affecting wincvs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

March Hare WINCVS before 2.8.01 build 6610, and CVS Suite before 2009R2 build 6610, contains an Insecure Library Loading vulnerability in the wincvs2.exe or wincvs.exe file, which may allow local users to gain privileges via a Trojan horse Python or TCL DLL file in the current working directory.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.8% (top 22%)
CISA exploited list	No
Weakness	CWE-426
Published	2018-02-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: march-hare

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

Am I affected?

Timeline

2018-02-05 07:29 UTCPublished CVE record published
2026-06-17 02:01 UTCUpdated Record last modified

march-hare wincvs UPGRADE

Affected: >= 1.0 and < 2.8.01

Fixed in: 2.8.01

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. UPGRADE to 2.8.01 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wincvs

Note

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

3. If no update is available yet, DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison wincvs sudo apt install wincvs=<VERSION_BEFORE_1.0> sudo apt-mark hold wincvs

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list wincvs sudo dnf downgrade wincvs-<VERSION_BEFORE_1.0> sudo dnf versionlock add wincvs

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-2018-6461?

wincvs: upgrade to 2.8.01. Exact commands for each OS are on this page.

Is CVE-2018-6461 being exploited?

CVE-2018-6461 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-2018-6461 affect?

CVE-2018-6461 affects wincvs. Severity is high (CVSS 7.8). March Hare WINCVS before 2.8.01 build 6610, and CVS Suite before 2009R2 build 6610, contains an Insecure Library Loading vulnerability in the wincvs2.exe or wincvs.exe file, which may allow local users to gain privileges via a Trojan horse

How urgent is CVE-2018-6461?

Priority 52/100. High severity; Public exploit reference

Software pages

Python vulnerabilities

References

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