CVE-2004-1309: Heap-based buffer overflow in the demux_open_bmp function in demux_bmp.c for Unix MPlayer 1.0pre5 allows remot

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HIGH 10.0DOWNGRADE

CVE-2004-1309 is a high-severity flaw (CVSS 10.0) affecting unix mplayer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow in the demux_open_bmp function in demux_bmp.c for Unix MPlayer 1.0pre5 allows remote attackers to execute arbitrary code via a bitmap (BMP) file containing a large biClrUsed field.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	5.2% (top 8%)
CISA exploited list	No
Published	2005-01-10
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: mplayer

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

Am I affected?

Timeline

2005-01-10 05:00 UTCPublished CVE record published
2026-06-16 22:07 UTCUpdated Record last modified

mplayer unix mplayer DOWNGRADE

Affected: 1.0_pre5

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0_pre5

1. Check installed version

apt-cache policy unix-mplayer || rpm -q unix-mplayer || unix-mplayer --version

2. No fixed release: DOWNGRADE to a release before 1.0_pre5 (Debian / Ubuntu)

apt-cache madison unix-mplayer sudo apt install unix-mplayer=<VERSION_BEFORE_1.0_pre5> sudo apt-mark hold unix-mplayer

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

dnf --showduplicates list unix-mplayer sudo dnf downgrade unix-mplayer-<VERSION_BEFORE_1.0_pre5> sudo dnf versionlock add unix-mplayer

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-2004-1309?

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

Is CVE-2004-1309 being exploited?

CVE-2004-1309 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-2004-1309 affect?

CVE-2004-1309 affects unix mplayer. Severity is high (CVSS 10.0). Heap-based buffer overflow in the demux_open_bmp function in demux_bmp.c for Unix MPlayer 1.0pre5 allows remote attackers to execute arbitrary code via a bitmap (BMP) file containing a large biClrUsed field.

How urgent is CVE-2004-1309?

Priority 58/100. Critical severity; EPSS top 8%: very likely to be exploited

References

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