CVE-2017-7793: Use After Free
A use-after-free vulnerability can occur in the Fetch API when the worker or the associated window are freed when still in use, resulting in a potentially exploitable crash.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 52.4 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 56 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 52.4 - Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 159.0.1-1 - Upgrade
Upgrade
debian/firefox-esrto a version that resolves this vulnerability.Fixed in 140.12.0esr-1~deb12u1Fixed in 153.6.0esr-1~deb12u2Fixed in 140.15.0esr-1~deb13u1Fixed in 153.6.0esr-1~deb13u1Fixed in 153.5.1esr-1Fixed in 153.6.0esr-1 - Upgrade
Upgrade
debian/thunderbirdto a version that resolves this vulnerability.Fixed in 1:140.12.0esr-1~deb12u1Fixed in 1:153.6.0esr-1~deb12u2Fixed in 1:140.12.0esr-1~deb13u1Fixed in 1:153.6.0esr-1~deb13u1Fixed in 1:153.5.0esr-1Fixed in 1:153.6.0esr-1
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is CVE-2017-7793?
CVE-2017-7793 is a use-after-free vulnerability affecting Firefox, Firefox ESR, and Thunderbird.
What is the severity of CVE-2017-7793?
The severity of CVE-2017-7793 is critical with a CVSS score of 9.8.
Which software versions are affected by CVE-2017-7793?
Firefox versions prior to 56, Firefox ESR versions prior to 52.4, and Thunderbird versions prior to 52.4 are affected by CVE-2017-7793.
How can I fix CVE-2017-7793?
Upgrade to Firefox 56 or later, Firefox ESR 52.4 or later, or Thunderbird 52.4 or later to fix CVE-2017-7793.
Where can I find more information about CVE-2017-7793?
You can find more information about CVE-2017-7793 on the Mozilla Bugzilla, Mozilla Security Advisories, and SecurityFocus websites.