critical
9.8
CWE
416
Advisory Published
Updated

CVE-2017-5440: Use After Free

First published: Wed Apr 19 2017(Updated: )

A use-after-free vulnerability during XSLT processing due to a failure to propagate error conditions during matching while evaluating context, leading to objects being used when they no longer exist. This results in a potentially exploitable crash.

Credit: security@mozilla.org security@mozilla.org security@mozilla.org

Affected SoftwareAffected VersionHow to fix
Mozilla Thunderbird<52.1
52.1
Mozilla Firefox ESR<52.1
52.1
Mozilla Firefox ESR<45.9
45.9
Mozilla Firefox<53
53
Debian GNU/Linux=8.0
Red Hat Enterprise Linux=6.0
Red Hat Enterprise Linux=7.0
redhat enterprise Linux desktop=6.0
redhat enterprise Linux desktop=7.0
redhat enterprise Linux server=6.0
redhat enterprise Linux server=7.0
redhat enterprise Linux server aus=7.3
redhat enterprise Linux server aus=7.4
redhat enterprise Linux server eus=7.3
redhat enterprise Linux server eus=7.4
redhat enterprise Linux server eus=7.5
redhat enterprise Linux workstation=6.0
redhat enterprise Linux workstation=7.0
Mozilla Firefox<53.0
Mozilla Firefox=52.0
Mozilla Firefox ESR<45.9.0
Mozilla Thunderbird<52.1.0
Mozilla Firefox ESR=52.0
debian/firefox
135.0-1
debian/firefox-esr
115.14.0esr-1~deb11u1
128.7.0esr-1~deb11u1
128.5.0esr-1~deb12u1
128.7.0esr-1~deb12u1
128.7.0esr-1

Remedy

https://bugzilla.mozilla.org/show_bug.cgi?id=1336832

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of CVE-2017-5440?

    CVE-2017-5440 is classified as a medium severity vulnerability that can lead to potentially exploitable crashes.

  • How do I fix CVE-2017-5440?

    To fix CVE-2017-5440, update your software to the latest versions including Firefox 53 or later, Firefox ESR 52.1 or later, or Thunderbird 52.1 or later.

  • Which software is affected by CVE-2017-5440?

    CVE-2017-5440 affects Mozilla Firefox, Firefox ESR, and Thunderbird versions prior to their respective fixed releases.

  • What type of vulnerability is CVE-2017-5440?

    CVE-2017-5440 is a use-after-free vulnerability that occurs during XSLT processing.

  • Can CVE-2017-5440 be exploited remotely?

    Yes, CVE-2017-5440 could potentially be exploited remotely, as it allows unintended access to memory after it has been freed.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203