CVE-2003-0535: Buffer overflow in xbl 1.0k and earlier allows local users to gain privileges via a long -display command line

Routine

HIGH 7.2DOWNGRADE

CVE-2003-0535 is a high-severity flaw (CVSS 7.2) affecting xbl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in xbl 1.0k and earlier allows local users to gain privileges via a long -display command line option.

Why this priority

High severity

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

Risk facts

CVSS score	7.2 (High)
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Published	2003-08-18
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: xblockout

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

Am I affected?

Timeline

2003-08-18 04:00 UTCPublished CVE record published
2026-06-16 22:02 UTCUpdated Record last modified

xblockout xbl DOWNGRADE

Affected: 1.0i · 1.0k · 1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0i

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0i (Debian / Ubuntu)

apt-cache madison xbl sudo apt install xbl=<VERSION_BEFORE_1.0i> sudo apt-mark hold xbl

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

dnf --showduplicates list xbl sudo dnf downgrade xbl-<VERSION_BEFORE_1.0i> sudo dnf versionlock add xbl

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.

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-2003-0535?

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

Is CVE-2003-0535 being exploited?

CVE-2003-0535 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-2003-0535 affect?

CVE-2003-0535 affects xbl. Severity is high (CVSS 7.2). Buffer overflow in xbl 1.0k and earlier allows local users to gain privileges via a long -display command line option.

How urgent is CVE-2003-0535?

Priority 33/100. High severity

Related CVEs

CVE-2003-0451 MEDIUM 4.6 UPGRADE Multiple buffer overflows in xbl before 1.0k allow local users to gain privileges via certain long command lin

References

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