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CVE-2018-17141: HylaFAX 6.0.6 and HylaFAX+ 5.6.0 allow remote attackers to execute arbitrary code via a dial-in session that p

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CRITICAL 9.8REMOTEWATCHLISTMITIGATEDOWNGRADEDOWNGRADE

CVE-2018-17141 is a critical-severity flaw (CVSS 9.8) affecting debian linux, hylafax, hylafax\+. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HylaFAX 6.0.6 and HylaFAX+ 5.6.0 allow remote attackers to execute arbitrary code via a dial-in session that provides a FAX page with the JPEG bit enabled, which is mishandled in FaxModem::writeECMData() in the faxd/CopyQuality.c++ file.

Why this priority

  • Critical severity
  • EPSS top 7%: very likely to be exploited
  • Public exploit reference
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance5.6% (top 7%)
CISA exploited listNo
WeaknessCWE-787, CWE-824
Published2018-09-21
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: debian · hylafax

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

Am I affected?

Timeline

debian debian linux MITIGATE
Affected: 8.0 · 9.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 8.0
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.
hylafax hylafax DOWNGRADE
Affected: 6.0.6
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.0.6
1. Check installed version
apt-cache policy hylafax || rpm -q hylafax || hylafax --version
2. No fixed release: DOWNGRADE to a release before 6.0.6 (Debian / Ubuntu)
apt-cache madison hylafax sudo apt install hylafax=<VERSION_BEFORE_6.0.6> sudo apt-mark hold hylafax
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list hylafax sudo dnf downgrade hylafax-<VERSION_BEFORE_6.0.6> sudo dnf versionlock add hylafax
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.
hylafax hylafax\+ DOWNGRADE
Affected: 5.6.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 5.6.0
1. Check installed version
apt-cache policy hylafax+ || rpm -q hylafax+ || hylafax+ --version
2. No fixed release: DOWNGRADE to a release before 5.6.0 (Debian / Ubuntu)
apt-cache madison hylafax+ sudo apt install hylafax+=<VERSION_BEFORE_5.6.0> sudo apt-mark hold hylafax+
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list hylafax+ sudo dnf downgrade hylafax+-<VERSION_BEFORE_5.6.0> sudo dnf versionlock add hylafax+
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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.
Fedora 46 · copyparty · FIXED · 1.20.26-1.fc46 · FEDORA-2026-8fbe18458e · source
sudo dnf upgrade --advisory=FEDORA-2026-8fbe18458e
Fedora ELN · man-pages · FIXED · 6.20-1.eln159 · FEDORA-2026-f1f5fb11b4 · source
sudo dnf upgrade --advisory=FEDORA-2026-f1f5fb11b4
Debian 12 · hylafax · FIXED · 3:6.0.6-8.1
sudo apt update && sudo apt install --only-upgrade hylafax dpkg --compare-versions "$(dpkg-query -W -f='${Version}' hylafax)" ge "3:6.0.6-8.1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · hylafax · FIXED · 3:6.0.6-8.1
sudo apt update && sudo apt install --only-upgrade hylafax dpkg --compare-versions "$(dpkg-query -W -f='${Version}' hylafax)" ge "3:6.0.6-8.1" && echo PATCHED || echo STILL-VULNERABLE
Alpine 3.20 · hylafax · FIXED · hylafax-6.0.6-r5
apk add --upgrade hylafax apk info -v hylafax
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-2018-17141?

debian linux: mitigate or apply the listed mitigation; hylafax: downgrade or apply the listed mitigation; hylafax\+: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-17141 being exploited?

CVE-2018-17141 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-2018-17141 affect?

CVE-2018-17141 affects debian linux, hylafax, hylafax\+. Severity is critical (CVSS 9.8). HylaFAX 6.0.6 and HylaFAX+ 5.6.0 allow remote attackers to execute arbitrary code via a dial-in session that provides a FAX page with the JPEG bit enabled, which is mishandled in FaxModem::writeECMData() in the faxd/CopyQuality.c++ file.

How urgent is CVE-2018-17141?

Priority 73/100. Critical severity; EPSS top 7%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

References

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