CVE-2007-3957: Buffer overflow in Nipun Jain xserver 0.1 alpha allows remote attackers to cause a denial of service via a POS

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MEDIUM 5.0DOWNGRADE

CVE-2007-3957 is a medium-severity flaw (CVSS 5.0) affecting xserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in Nipun Jain xserver 0.1 alpha allows remote attackers to cause a denial of service via a POST request with a long URI.

Why this priority

EPSS top 6%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	6.8% (top 6%)
CISA exploited list	No
Published	2007-07-24
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: nipun jain

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

Am I affected?

Timeline

2007-07-24 18:30 UTCPublished CVE record published
2026-06-16 22:43 UTCUpdated Record last modified

nipun jain xserver DOWNGRADE

Affected: 0.1_alpha

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.1_alpha

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.1_alpha (Debian / Ubuntu)

apt-cache madison xserver sudo apt install xserver=<VERSION_BEFORE_0.1_alpha> sudo apt-mark hold xserver

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

dnf --showduplicates list xserver sudo dnf downgrade xserver-<VERSION_BEFORE_0.1_alpha> sudo dnf versionlock add xserver

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: Xserver 0.1 Alpha - 'POST' Remote Buffer Overflow (PoC)

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-2007-3957?

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

Is CVE-2007-3957 being exploited?

CVE-2007-3957 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-2007-3957 affect?

CVE-2007-3957 affects xserver. Severity is medium (CVSS 5.0). Buffer overflow in Nipun Jain xserver 0.1 alpha allows remote attackers to cause a denial of service via a POST request with a long URI.

How urgent is CVE-2007-3957?

Priority 46/100. EPSS top 6%: very likely to be exploited; Public exploit reference

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References

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