CVE-2015-1803

Ubuntu Linux vulnerability

CVSS

8.5

EPSS

4.9%

EPSS pct

91th

Exploited

No known

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.

Affected vendor

Canonical

Affected product

Ubuntu Linux

CVSS vector

AV:N/AC:M/Au:S/C:C/I:C/A:C

Published

2015-03-20

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, medium attack complexity, requiring single-factor authentication. Successful exploitation leads to complete impact to confidentiality, complete impact to integrity, complete impact to availability.

Its EPSS score of 4.9% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 91% of all scored CVEs.

Check your external exposure to CVE-2015-1803

Confirm whether Canonical Ubuntu Linux is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2015-1803.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2015-1803

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2015-1803 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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