THREATPORT/VULNERABILITY/CVE-2017-7805
HIGH SEVERITY

CVE-2017-7805

Firefox vulnerability

CVSS
7.5
EPSS
3.2%
EPSS pct
87th
Exploited
No known
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.
Affected vendor
Mozilla
Affected product
Firefox
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)
Published
2018-06-11

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 3.2% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 87% of all scored CVEs.

Check your external exposure to CVE-2017-7805

  • Confirm whether Mozilla Firefox is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2017-7805.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2017-7805

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2017-7805 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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