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CVE-2000-1134: Multiple shell programs on various Unix systems, including (1) tcsh, (2) csh, (3) sh, and (4) bash, follow sym

53
This month
HIGH 7.2WATCHLISTDOWNGRADEMITIGATEMITIGATE

CVE-2000-1134 is a high-severity flaw (CVSS 7.2) affecting immunix, linux, openlinux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple shell programs on various Unix systems, including (1) tcsh, (2) csh, (3) sh, and (4) bash, follow symlinks when processing << redirects (aka here-documents or in-here documents), which allows local users to overwrite files of other users via a symlink attack.

Why this priority

  • High severity
  • Public exploit reference
  • On your watchlist

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

Risk facts

CVSS score7.2 (High)
EPSS exploit chance1.4% (top 27%)
CISA exploited listNo
Published2001-01-09
Last modified2026-06-16
Publisher (CNA): MITRE · Vendor: caldera · conectiva · hp · immunix

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

Am I affected?

Timeline

immunix immunix DOWNGRADE
Affected: 6.2
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.2
1. Check installed version
apt-cache policy immunix || rpm -q immunix || immunix --version
2. No fixed release: DOWNGRADE to a release before 6.2 (Debian / Ubuntu)
apt-cache madison immunix sudo apt install immunix=<VERSION_BEFORE_6.2> sudo apt-mark hold immunix
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list immunix sudo dnf downgrade immunix-<VERSION_BEFORE_6.2> sudo dnf versionlock add immunix
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.
conectiva linux MITIGATE
Affected: 4.0 · 4.0es · 4.1 · 4.2 · 5.0 · 5.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 4.0
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.
caldera openlinux MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
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.
caldera openlinux edesktop MITIGATE
Affected: 2.4
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.4
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.
caldera openlinux eserver MITIGATE
Affected: 2.3
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.3
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.
hp hp-ux MITIGATE
Affected: 11.11
Fixed in: no fixed release known
Safe to downgrade to: a release before 11.11
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.

Public exploits and detection

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

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-2000-1134?

immunix: downgrade or apply the listed mitigation; linux: mitigate or apply the listed mitigation; openlinux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2000-1134 being exploited?

CVE-2000-1134 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-2000-1134 affect?

CVE-2000-1134 affects immunix, linux, openlinux. Severity is high (CVSS 7.2). Multiple shell programs on various Unix systems, including (1) tcsh, (2) csh, (3) sh, and (4) bash, follow symlinks when processing << redirects (aka here-documents or in-here documents), which allows local users to overwrite files of other

How urgent is CVE-2000-1134?

Priority 53/100. High severity; Public exploit reference; On your watchlist

Related CVEs

References

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