CVE-2017-5398

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-06-11 · updated 2026-06-17
Weakness: CWE-119

Description

Memory safety bugs were reported in Thunderbird 45.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 52, Firefox ESR < 45.8, Thunderbird < 52, and Thunderbird < 45.8.

Affected products

Debian Linux: 8.0, 9.0
Mozilla Firefox: before 52.0; before 45.8.0 — fixed in 45.8.0, 52.0
Mozilla Thunderbird: before 52.0 — fixed in 52.0
Mozilla Thunderbird ESR: before 45.8.0 — fixed in 45.8.0
RedHat Enterprise Linux Desktop: 5.0, 6.0, 7.0
RedHat Enterprise Linux Server: 5.0, 6.0, 7.0
RedHat Enterprise Linux Server Aus: 7.3, 7.4
RedHat Enterprise Linux Server Eus: 7.3, 7.4, 7.5
RedHat Enterprise Linux Workstation: 5.0, 6.0, 7.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 45.8.0, 52.0; Mozilla Thunderbird 52.0; Mozilla Thunderbird ESR 45.8.0. Check the vendor advisory for mitigations.

References

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