CVE-2015-3905: Buffer overflow in the set_cs_start function in t1disasm.c in t1utils before 1.39 allows remote attackers to c

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HIGH 7.5WATCHLISTMITIGATEDOWNGRADE

CVE-2015-3905 is a high-severity flaw (CVSS 7.5) affecting ubuntu linux, t1utils. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in the set_cs_start function in t1disasm.c in t1utils before 1.39 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted font file.

Why this priority

High severity
EPSS top 6%: very likely to be exploited
Public exploit reference
On your watchlist

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	6.9% (top 6%)
CISA exploited list	No
Weakness	CWE-119
Published	2015-06-08
Last modified	2026-06-17

Publisher (CNA): Debian GNU/Linux · Vendor: canonical · t1utils project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2015-06-08 14:59 UTCPublished CVE record published
2026-06-17 00:26 UTCUpdated Record last modified

canonical ubuntu linux MITIGATE

Affected: 14.04 · 14.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 14.04

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

t1utils project t1utils DOWNGRADE

Affected: 1.38

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.38

1. Check installed version

apt-cache policy t1utils || rpm -q t1utils || t1utils --version

2. No fixed release: DOWNGRADE to a release before 1.38 (Debian / Ubuntu)

apt-cache madison t1utils sudo apt install t1utils=<VERSION_BEFORE_1.38> sudo apt-mark hold t1utils

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

dnf --showduplicates list t1utils sudo dnf downgrade t1utils-<VERSION_BEFORE_1.38> sudo dnf versionlock add t1utils

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-2015-3905?

ubuntu linux: mitigate or apply the listed mitigation; t1utils: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-3905 being exploited?

CVE-2015-3905 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-2015-3905 affect?

CVE-2015-3905 affects ubuntu linux, t1utils. Severity is high (CVSS 7.5). Buffer overflow in the set_cs_start function in t1disasm.c in t1utils before 1.39 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted font file.

How urgent is CVE-2015-3905?

Priority 60/100. High severity; EPSS top 6%: very likely to be exploited; Public exploit reference; On your watchlist

Software pages

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References

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