critical
9.1
CWE
416
Advisory Published
Updated

CVE-2017-5447: Use After Free

First published: Wed Apr 19 2017(Updated: )

An out-of-bounds read during the processing of glyph widths during text layout. This results in a potentially exploitable crash and could allow an attacker to read otherwise inaccessible memory.

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=9.0
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

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-2017-5447?

    CVE-2017-5447 has a moderate severity rating due to the potential for memory disclosure and application crashes.

  • How do I fix CVE-2017-5447?

    To remediate CVE-2017-5447, users should update to the latest versions of affected software, specifically Mozilla Thunderbird version 52.1 or higher, and Firefox ESR versions 52.1 or higher.

  • Which software is affected by CVE-2017-5447?

    CVE-2017-5447 affects Mozilla Thunderbird, Mozilla Firefox, and various versions of Firefox ESR prior to specified patches.

  • What are the consequences of CVE-2017-5447?

    Exploiting CVE-2017-5447 can lead to a crash of the affected application and potential exposure of sensitive memory content.

  • Is CVE-2017-5447 actively exploited in the wild?

    As of the latest information, there have been no reported active exploits for CVE-2017-5447, but users should apply updates as a precaution.

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