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Use After Free Affecting firefox-esr package, versions <52.4.0esr-2

Severity

 Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
3.15% (87th percentile)

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  • Snyk IDSNYK-ECHOLATEST-FIREFOXESR-18168731
  • published22 Jul 2026
  • disclosed11 Jun 2018
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Introduced: 11 Jun 2018

CVE-2017-7805  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Echo:latest firefox-esr to version 52.4.0esr-2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox-esr package and not the firefox-esr package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.