Is CVE-2015-1803 in the CISA KEV catalog?

No. CVE-2015-1803 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-1803?

CVE-2015-1803 has a CVSS v2 base score of 8.5 (HIGH).

What is the EPSS score for CVE-2015-1803?

CVE-2015-1803 has an EPSS score of 4.86% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-1803?

Upgrade libxfont on debian 11 to 1:1.5.1-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2015-1803

HIGHEPSS 91th pctl

8.5

CVSS v2

NVD

Description

The bdfReadCharacters function in bitmap/bdfread.c in X.Org libXfont before 1.4.9 and 1.5.x before 1.5.1 does not properly handle character bitmaps it cannot read, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and crash) and possibly execute arbitrary code via a crafted BDF font file.

How to fix

Remediation Available

libxfontDebian

Fixed in:1:1.5.1-1CVE-2015-1803

libxfontUbuntu

Fixed in:1:1.4.7-1ubuntu0.2USN-2536-1

libxfont1Ubuntu

Fixed in:1:1.4.7-1ubuntu0.2USN-2536-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

4.86%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Vendor Advisory1

x.org

Other references15

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.