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CVE-2017-5401: A crash triggerable by web content in which an "ErrorResult" references unassigned memory due to a logic error

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CRITICAL 9.8REMOTEWATCHLISTMITIGATEMITIGATEMITIGATE

CVE-2017-5401 is a critical-severity flaw (CVSS 9.8) affecting debian linux, enterprise linux, enterprise linux desktop. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A crash triggerable by web content in which an "ErrorResult" references unassigned memory due to a logic error. The resulting crash may be exploitable. This vulnerability affects Firefox < 52, Firefox ESR < 45.8, Thunderbird < 52, and Thunderbird < 45.8.

Why this priority

  • Critical severity
  • 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 chance3.0% (top 13%)
CISA exploited listNo
WeaknessCWE-388
Published2018-06-11
Last modified2026-06-17
Publisher (CNA): Mozilla Corporation · Vendor: debian · redhat

Share: LinkedIn · X · Reddit

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: 9.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 9.0
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.
redhat enterprise linux MITIGATE
Affected: 5.0 · 6.0 · 7.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 5.0
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.
redhat enterprise linux desktop MITIGATE
Affected: 5.0 · 6.0 · 7.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 5.0
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.
redhat enterprise linux server MITIGATE
Affected: 5.0 · 6.0 · 7.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 5.0
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.
redhat enterprise linux server aus MITIGATE
Affected: 7.3 · 7.4
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.3
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.
redhat enterprise linux server eus MITIGATE
Affected: 7.3 · 7.4 · 7.5
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.3
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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.
Fedora 46 · librepo · FIXED · 1.21.3-1.fc46 · FEDORA-2026-c502136ca7 · source
sudo dnf upgrade --advisory=FEDORA-2026-c502136ca7
Debian 12 · firefox-esr · FIXED · 45.8.0esr-1
sudo apt update && sudo apt install --only-upgrade firefox-esr dpkg --compare-versions "$(dpkg-query -W -f='${Version}' firefox-esr)" ge "45.8.0esr-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · firefox-esr · FIXED · 45.8.0esr-1
sudo apt update && sudo apt install --only-upgrade firefox-esr dpkg --compare-versions "$(dpkg-query -W -f='${Version}' firefox-esr)" ge "45.8.0esr-1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 5 · firefox · FIXED · firefox-45.8.0-2.el5_11
sudo dnf upgrade --advisory=RHSA-2017:0459 rpm -q firefox
RHEL 5 · thunderbird · FIXED · thunderbird-45.8.0-1.el5_11
sudo dnf upgrade --advisory=RHSA-2017:0498 rpm -q thunderbird
RHEL 6 · firefox · FIXED · firefox-45.8.0-2.el6_8
sudo dnf upgrade --advisory=RHSA-2017:0459 rpm -q firefox
RHEL 6 · thunderbird · FIXED · thunderbird-45.8.0-1.el6_8
sudo dnf upgrade --advisory=RHSA-2017:0498 rpm -q thunderbird
RHEL 7 · firefox · FIXED · firefox-52.0-4.el7_3
sudo dnf upgrade --advisory=RHSA-2017:0461 rpm -q firefox

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

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-2017-5401?

debian linux: mitigate or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation; enterprise linux desktop: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-5401 being exploited?

CVE-2017-5401 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-2017-5401 affect?

CVE-2017-5401 affects debian linux, enterprise linux, enterprise linux desktop. Severity is critical (CVSS 9.8). A crash triggerable by web content in which an "ErrorResult" references unassigned memory due to a logic error. The resulting crash may be exploitable. This vulnerability affects Firefox < 52, Firefox ESR < 45.8, Thunderbird < 52, and Thund

How urgent is CVE-2017-5401?

Priority 71/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities · Mozilla Firefox vulnerabilities · Mozilla Thunderbird vulnerabilities

Related CVEs

References

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