Vulnerability Database

299,759

Total vulnerabilities in the database

CVE-2017-7805

During TLS 1.2 exchanges, handshake hashes are generated which point to a message buffer. This saved data is used for later messages but in some cases, the handshake transcript can exceed the space available in the current buffer, causing the allocation of a new buffer. This leaves a pointer pointing to the old, freed buffer, resulting in a use-after-free when handshake hashes are then calculated afterwards. This can result in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.

  • Published: Jun 11, 2018
  • Updated: Nov 9, 2025
  • CVE: CVE-2017-7805
  • Severity: Medium
  • Exploit:

CVSS v2:

  • Severity: Medium
  • Score: 5
  • AV:N/AC:L/Au:N/C:N/I:N/A:P

CWEs:

Software From Fixed in
mozilla / firefox 56.0 56.0.x
mozilla / thunderbird 52.4.0 52.4.0.x
debian / debian_linux 8.0 8.0.x
debian / debian_linux 7.0 7.0.x
debian / debian_linux 9.0 9.0.x
mozilla / firefox 52.4.0 52.4.0.x