CVE-2012-6306: A vulnerability exists in HCView (aka Hardcoreview) 1.4 due to a write access violation with a GIF file.

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2012-6306 is a critical-severity flaw (CVSS 9.8) affecting hcview. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability exists in HCView (aka Hardcoreview) 1.4 due to a write access violation with a GIF file.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Published	2020-02-06
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: hcview project

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

Am I affected?

Timeline

2020-02-06 18:15 UTCPublished CVE record published
2026-06-16 23:47 UTCUpdated Record last modified

hcview project hcview DOWNGRADE

Affected: 1.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.4 (Debian / Ubuntu)

apt-cache madison hcview sudo apt install hcview=<VERSION_BEFORE_1.4> sudo apt-mark hold hcview

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

dnf --showduplicates list hcview sudo dnf downgrade hcview-<VERSION_BEFORE_1.4> sudo dnf versionlock add hcview

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-2012-6306?

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

Is CVE-2012-6306 being exploited?

CVE-2012-6306 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-2012-6306 affect?

CVE-2012-6306 affects hcview. Severity is critical (CVSS 9.8). A vulnerability exists in HCView (aka Hardcoreview) 1.4 due to a write access violation with a GIF file.

How urgent is CVE-2012-6306?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

References

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