CVE-2000-0949: Heap overflow in savestr function in LBNL traceroute 1.4a5 and earlier allows a local user to execute arbitrar

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HIGH 7.2DOWNGRADEMITIGATE

CVE-2000-0949 is a high-severity flaw (CVSS 7.2) affecting lbl traceroute, sunos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap overflow in savestr function in LBNL traceroute 1.4a5 and earlier allows a local user to execute arbitrary commands via the -g option.

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	1.2% (top 32%)
CISA exploited list	No
Published	2000-12-19
Last modified	2026-09-23

Publisher (CNA): MITRE · Vendor: lbl · sun

Last updated 2026-09-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2000-12-19 05:00 UTCPublished CVE record published
2026-09-23 10:10 UTCUpdated Record last modified

lbl lbl traceroute DOWNGRADE

Affected: 1.4a5

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4a5

1. Check installed version

apt-cache policy lbl-traceroute || rpm -q lbl-traceroute || lbl-traceroute --version

2. No fixed release: DOWNGRADE to a release before 1.4a5 (Debian / Ubuntu)

apt-cache madison lbl-traceroute sudo apt install lbl-traceroute=<VERSION_BEFORE_1.4a5> sudo apt-mark hold lbl-traceroute

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

dnf --showduplicates list lbl-traceroute sudo dnf downgrade lbl-traceroute-<VERSION_BEFORE_1.4a5> sudo dnf versionlock add lbl-traceroute

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.

sun sunos MITIGATE

Affected: 5.5.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.5.1

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: LBL Traceroute - Local Privilege Escalation
Exploit-DB: LBL Traceroute 1.4 a5 - Heap Corruption (1)
Exploit-DB: LBL Traceroute 1.4 a5 - Heap Corruption (2)
Exploit-DB: LBL Traceroute 1.4 a5 - Heap Corruption (3)

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-2000-0949?

lbl traceroute: downgrade or apply the listed mitigation; sunos: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2000-0949 being exploited?

CVE-2000-0949 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-2000-0949 affect?

CVE-2000-0949 affects lbl traceroute, sunos. Severity is high (CVSS 7.2). Heap overflow in savestr function in LBNL traceroute 1.4a5 and earlier allows a local user to execute arbitrary commands via the -g option.

How urgent is CVE-2000-0949?

Priority 47/100. High severity; Public exploit reference

References

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