CVE-2004-0313: Buffer overflow in PSOProxy 0.91 allows remote attackers to cause a denial of service and possibly execute arb

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HIGH 10.0DOWNGRADE

CVE-2004-0313 is a high-severity flaw (CVSS 10.0) affecting psoproxy server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in PSOProxy 0.91 allows remote attackers to cause a denial of service and possibly execute arbitrary code via a long HTTP request, as demonstrated using a long (1) GET argument or (2) method name.

Why this priority

Critical severity
EPSS top 1%: 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	63.6% (top 1%)
CISA exploited list	No
Published	2004-11-23
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: psoproxy

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

Am I affected?

Timeline

2004-11-23 05:00 UTCPublished CVE record published
2026-06-16 22:05 UTCUpdated Record last modified

psoproxy psoproxy server DOWNGRADE

Affected: 0.91

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.91

1. Check installed version

apt-cache policy psoproxy-server || rpm -q psoproxy-server || psoproxy-server --version

2. No fixed release: DOWNGRADE to a release before 0.91 (Debian / Ubuntu)

apt-cache madison psoproxy-server sudo apt install psoproxy-server=<VERSION_BEFORE_0.91> sudo apt-mark hold psoproxy-server

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

dnf --showduplicates list psoproxy-server sudo dnf downgrade psoproxy-server-<VERSION_BEFORE_0.91> sudo dnf versionlock add psoproxy-server

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: PSOProxy 0.91 - Stack Buffer Overflow (Metasploit)
Exploit-DB: PSOProxy 0.91 (Windows 2000/XP) - Remote Buffer Overflow
Exploit-DB: PSOProxy 0.91 - Remote Buffer Overflow (1)
Exploit-DB: PSOProxy 0.91 - Remote Buffer Overflow (2)
Exploit-DB: PSOProxy 0.91 - Remote Buffer Overflow (3)
Metasploit: PSO Proxy v0.91 Stack Buffer Overflow

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-2004-0313?

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

Is CVE-2004-0313 being exploited?

CVE-2004-0313 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-2004-0313 affect?

CVE-2004-0313 affects psoproxy server. Severity is high (CVSS 10.0). Buffer overflow in PSOProxy 0.91 allows remote attackers to cause a denial of service and possibly execute arbitrary code via a long HTTP request, as demonstrated using a long (1) GET argument or (2) method name.

How urgent is CVE-2004-0313?

Priority 65/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference

References

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