In the PatternMatch function in fontfile/fontdir.c in libXfont through 1.5.2 and 2.x before 2.0.2, an attacker with access to an X connectio
In the PatternMatch function in fontfile/fontdir.c in libXfont through 1.5.2 and 2.x before 2.0.2, an attacker with access to an X connection can cause a buffer over-read during pattern matching of fonts, leading to information disclosure or a crash (denial of service). This occurs because '\0' characters are incorrectly skipped in situations involving ? characters.
- Published
- Oct 11, 2017
- Updated
- Jun 16, 2026
- EPSS
- 0.4% · 36th percentile
- CWE
- CWE-125
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Report tools
Action score
28
Monitor
Low priority for now.
- CVSS
- 28 / 40 · 7.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| x.org | libxfont | cpe:2.3:a:x.org:libxfont |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- x.org libxfontup to 1.5.2 inclusive
- x.org libxfont2.0.0
- x.org libxfont2.0.1
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | libxfont | before 1:2.0.1-4 | 1:2.0.1-4 |
| Debian:7 | libxfont | before 1:1.4.5-5+deb7u1 | 1:1.4.5-5+deb7u1 |
| Debian:8 | libxfont | before 1:1.5.1-1+deb8u1 | 1:1.5.1-1+deb8u1 |
| Debian:9 | libxfont | before 1:2.0.1-3+deb9u1 | 1:2.0.1-3+deb9u1 |
| openSUSE:Tumbleweed | libXfont | before 1.5.4-2.18 | 1.5.4-2.18 |
| SUSE:Linux Enterprise Desktop 12 SP2 | libXfont | before 1.5.1-11.3.12 | 1.5.1-11.3.12 |
| SUSE:Linux Enterprise Software Development Kit 11 SP4 | xorg-x11-libs | before 7.4-8.26.50.5.3 | 7.4-8.26.50.5.3 |
Same product
x.org: all recordsOther highest-scoring records for the same primary product.
- CVE-2007-1351Integer overflow in the bdfReadCharacters function in bdfread.c in (1) X.Org libXfont before 20070403 and (2) freetype 2.3.2 and earlier all36Monitor
- CVE-2017-13722In the pcfGetProperties function in bitmap/pcfread.c in libXfont through 1.5.2 and 2.x before 2.0.2, a missing boundary check (for PCF files28Monitor
- CVE-2007-1352Integer overflow in the FontFileInitTable function in X.Org libXfont before 20070403 allows remote authenticated users to execute arbitrary 15Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:libxfont | 1:2.0.1-4 · Debian:12 | Package registry (OSV) |
| opensuse:libXfont | 1.5.4-2.18 · openSUSE:Tumbleweed | Package registry (OSV) |
| suse:libXfont | 1.5.1-11.3.12 · SUSE:Linux Enterprise Desktop 12 SP2 | Package registry (OSV) |
| suse:xorg-x11-libs | 7.4-8.26.50.5.3 · SUSE:Linux Enterprise Software Development Kit 11 SP4 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
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References
- www.debian.org/security/2017/dsa-3995
- bugzilla.redhat.com/show_bug.cgi?id=1500690
- bugzilla.suse.com/show_bug.cgi?id=1054285
- cgit.freedesktop.org/xorg/lib/libXfont/commit/?id=d1e670a4a8704b8708e493ab6155589bcd570608
- security.gentoo.org/glsa/201711-08
- www.x.org/releases/individual/lib/libXfont2-2.0.2.tar.bz2
Vendor advisories and official records. Exploit/PoC links are deliberately left out.