CVE-2004-1286: Buffer overflow in the auto_filter_extern function in auto.c for NapShare 1.2, with the extern filter enabled,

This week

HIGH 10.0DOWNGRADE

CVE-2004-1286 is a high-severity flaw (CVSS 10.0) affecting napshare. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in the auto_filter_extern function in auto.c for NapShare 1.2, with the extern filter enabled, allows remote attackers to execute arbitrary code via a crafted gnutella response.

Why this priority

Critical severity
EPSS top 4%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	12.4% (top 4%)
CISA exploited list	No
Published	2005-01-10
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: napshare

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

napshare napshare DOWNGRADE

Affected: 1.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2 (Debian / Ubuntu)

apt-cache madison napshare sudo apt install napshare=<VERSION_BEFORE_1.2> sudo apt-mark hold napshare

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

dnf --showduplicates list napshare sudo dnf downgrade napshare-<VERSION_BEFORE_1.2> sudo dnf versionlock add napshare

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: NapShare 1.2 - Remote Buffer Overflow (1)
Exploit-DB: NapShare 1.2 - Remote Buffer Overflow (2)

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-2004-1286?

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

Is CVE-2004-1286 being exploited?

CVE-2004-1286 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-2004-1286 affect?

CVE-2004-1286 affects napshare. Severity is high (CVSS 10.0). Buffer overflow in the auto_filter_extern function in auto.c for NapShare 1.2, with the extern filter enabled, allows remote attackers to execute arbitrary code via a crafted gnutella response.

How urgent is CVE-2004-1286?

Priority 64/100. Critical severity; EPSS top 4%: very likely to be exploited; Public exploit reference

References

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