CVE-2000-1103: rcvtty in BSD 3.0 and 4.0 does not properly drop privileges before executing a script, which allows local atta

This month

HIGH 7.2MITIGATE

CVE-2000-1103 is a high-severity flaw (CVSS 7.2) affecting bsd os. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

rcvtty in BSD 3.0 and 4.0 does not properly drop privileges before executing a script, which allows local attackers to gain privileges by specifying an alternate Trojan horse script on the command line.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.2 (High)
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Published	2001-01-09
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: bsdi

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

Am I affected?

Timeline

2001-01-09 05:00 UTCPublished CVE record published
2026-06-16 21:53 UTCUpdated Record last modified

bsdi bsd os MITIGATE

Affected: 3.0 · 3.1 · 4.0 · 4.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

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.

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: BSDi 3.0/4.0 - 'rcvtty[mh]' Local Privilege Escalation

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-2000-1103?

bsd os: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2000-1103 being exploited?

CVE-2000-1103 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-2000-1103 affect?

CVE-2000-1103 affects bsd os. Severity is high (CVSS 7.2). rcvtty in BSD 3.0 and 4.0 does not properly drop privileges before executing a script, which allows local attackers to gain privileges by specifying an alternate Trojan horse script on the command line.

How urgent is CVE-2000-1103?

Priority 45/100. High severity; Public exploit reference

Related CVEs

CVE-2008-4609 HIGH 7.1 MITIGATE MITIGATE The TCP implementation in (1) Linux, (2) platforms based on BSD Unix, (3) Microsoft Windows, (4) Cisco product
CVE-2001-1541 HIGH 7.2 MITIGATE Buffer overflow in Unix-to-Unix Copy Protocol (UUCP) in BSDI BSD/OS 3.0 through 4.2 allows local users to exec
CVE-2001-1154 MEDIUM 5.0 DOWNGRADE MITIGATE Cyrus 2.0.15, 2.0.16, and 1.6.24 on BSDi 4.2, with IMAP enabled, allows remote attackers to cause a denial of
CVE-2001-1133 LOW 2.1 MITIGATE Vulnerability in a system call in BSDI 3.0 and 3.1 allows local users to cause a denial of service (reboot) in
CVE-1999-0880 MEDIUM 5.0 MITIGATE MITIGATE Denial of service in WU-FTPD via the SITE NEWER command, which does not free memory properly.

References

← Back to latest CVEs