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CVE-2002-0835: Preboot eXecution Environment (PXE) server allows remote attackers to cause a denial of service (crash) via ce

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MEDIUM 5.0WATCHLISTDOWNGRADEDOWNGRADEDOWNGRADE

CVE-2002-0835 is a medium-severity flaw (CVSS 5.0) affecting openlinux server, openlinux workstation, pre-execution environment. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Preboot eXecution Environment (PXE) server allows remote attackers to cause a denial of service (crash) via certain DHCP packets from Voice-Over-IP (VOIP) phones.

Why this priority

  • EPSS top 6%: very likely to be exploited
  • Public exploit reference
  • On your watchlist

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

Risk facts

CVSS score5.0 (Medium)
EPSS exploit chance6.9% (top 6%)
CISA exploited listNo
Published2002-10-04
Last modified2026-06-16
Publisher (CNA): MITRE · Vendor: caldera · hp · redhat

Share: LinkedIn · X · Reddit

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

Am I affected?

Timeline

caldera openlinux server DOWNGRADE
Affected: 3.1 · 3.1.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.1
1. Check installed version
apt-cache policy openlinux-server || rpm -q openlinux-server || openlinux-server --version
2. No fixed release: DOWNGRADE to a release before 3.1 (Debian / Ubuntu)
apt-cache madison openlinux-server sudo apt install openlinux-server=<VERSION_BEFORE_3.1> sudo apt-mark hold openlinux-server
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list openlinux-server sudo dnf downgrade openlinux-server-<VERSION_BEFORE_3.1> sudo dnf versionlock add openlinux-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.
caldera openlinux workstation DOWNGRADE
Affected: 3.1 · 3.1.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.1
1. Check installed version
apt-cache policy openlinux-workstation || rpm -q openlinux-workstation || openlinux-workstation --version
2. No fixed release: DOWNGRADE to a release before 3.1 (Debian / Ubuntu)
apt-cache madison openlinux-workstation sudo apt install openlinux-workstation=<VERSION_BEFORE_3.1> sudo apt-mark hold openlinux-workstation
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list openlinux-workstation sudo dnf downgrade openlinux-workstation-<VERSION_BEFORE_3.1> sudo dnf versionlock add openlinux-workstation
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.
redhat pre-execution environment DOWNGRADE
Affected: 0.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 0.1
1. Check installed version
apt-cache policy pre-execution-environment || rpm -q pre-execution-environment || pre-execution-environment --version
2. No fixed release: DOWNGRADE to a release before 0.1 (Debian / Ubuntu)
apt-cache madison pre-execution-environment sudo apt install pre-execution-environment=<VERSION_BEFORE_0.1> sudo apt-mark hold pre-execution-environment
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list pre-execution-environment sudo dnf downgrade pre-execution-environment-<VERSION_BEFORE_0.1> sudo dnf versionlock add pre-execution-environment
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.
hp secure os MITIGATE
Affected: 1.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
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-2002-0835?

openlinux server: downgrade or apply the listed mitigation; openlinux workstation: downgrade or apply the listed mitigation; pre-execution environment: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2002-0835 being exploited?

CVE-2002-0835 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-2002-0835 affect?

CVE-2002-0835 affects openlinux server, openlinux workstation, pre-execution environment. Severity is medium (CVSS 5.0). Preboot eXecution Environment (PXE) server allows remote attackers to cause a denial of service (crash) via certain DHCP packets from Voice-Over-IP (VOIP) phones.

How urgent is CVE-2002-0835?

Priority 51/100. EPSS top 6%: very likely to be exploited; Public exploit reference; On your watchlist

Related CVEs

References

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