How severe is CVE-2003-0063?

CVE-2003-0063 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2003-0063 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2003-0063?

CVE-2003-0063 primarily affects Xfree86 Project X11r6. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2003-0063?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2003-0063 published?

CVE-2003-0063 was published on 2003-03-03 and last updated on 2026-06-16.

CVE-2003-0063

CVE-2003-0063 is a high-severity vulnerability in Xfree86 Project X11r6 with a CVSS 3.x base score of 7.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.3)
CVSS v2: 7.5
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Xfree86 Project X11r6
Published: 2003-03-03
Last modified: 2026-06-16

Description

The xterm terminal emulator in XFree86 4.2.0 and earlier allows attackers to modify the window title via a certain character escape sequence and then insert it back to the command line in the user's terminal, e.g. when the user views a file containing the malicious sequence, which could allow the attacker to execute arbitrary commands.

Frequently asked questions

What is CVE-2003-0063?: The xterm terminal emulator in XFree86 4.2.0 and earlier allows attackers to modify the window title via a certain character escape sequence and then insert it back to the command line in the user's terminal, e.g. when the user views a file containing the malicious sequence, which could allow the attacker to execute arbitrary commands.
How severe is CVE-2003-0063?: CVE-2003-0063 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2003-0063 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-0063?: CVE-2003-0063 primarily affects Xfree86 Project X11r6. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2003-0063?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2003-0063 published?: CVE-2003-0063 was published on 2003-03-03 and last updated on 2026-06-16.

References

Affected products (6)

cpe:2.3:a:xfree86_project:x11r6:4.0:*:*:*:*:*:*:*
cpe:2.3:a:xfree86_project:x11r6:4.0.1:*:*:*:*:*:*:*
cpe:2.3:a:xfree86_project:x11r6:4.0.3:*:*:*:*:*:*:*
cpe:2.3:a:xfree86_project:x11r6:4.1.0:*:*:*:*:*:*:*
cpe:2.3:a:xfree86_project:x11r6:4.2.0:*:*:*:*:*:*:*
cpe:2.3:a:xfree86_project:x11r6:4.2.1:*:*:*:*:*:*:*

More vulnerabilities in Xfree86 Project X11r6

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CVE-2004-0084 — Critical (CVSS 10.0): Buffer overflow in the ReadFontAlias function in XFree86 4.1.0 to 4.3.0, when using the CopyISOLatin1Lowered function,…
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CVE-1999-0241 — Critical (CVSS 10.0): Guessable magic cookies in X Windows allows remote attackers to execute commands, e.g. through xterm.
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All CVEs affecting Xfree86 Project X11r6 →