What’s Vulnerable › Vulnerabilities

CVE-2017-5373

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.3% 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 Firefox 50.1 and Firefox ESR 45.6. 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 Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

Affected products

• Debian Linux: 8.0
• Mozilla Firefox: before 45.7.0; before 51.0 — fixed in 45.7.0, 51.0
• Mozilla Thunderbird: before 45.7.0 — fixed in 45.7.0
• RedHat Enterprise Linux Desktop: 5.0, 6.0, 7.0
• RedHat Enterprise Linux Server: 5.0, 6.0, 7.0
• RedHat Enterprise Linux Workstation: 5.0, 6.0, 7.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 45.7.0, 51.0; Mozilla Thunderbird 45.7.0. Check the vendor advisory for mitigations.

References

• http://rhn.redhat.com/errata/RHSA-2017-0190.html
• http://rhn.redhat.com/errata/RHSA-2017-0238.html
• http://www.securityfocus.com/bid/95762
• http://www.securitytracker.com/id/1037693
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1322315%2C1328834%2C1322420%2C1285833%2C1285960%2C1328251%2C1331058%2C1325938%2C1325877
• https://security.gentoo.org/glsa/201702-13
• https://security.gentoo.org/glsa/201702-22
• https://www.debian.org/security/2017/dsa-3771
• https://www.debian.org/security/2017/dsa-3832
• https://www.mozilla.org/security/advisories/mfsa2017-01/
• https://www.mozilla.org/security/advisories/mfsa2017-02/
• https://www.mozilla.org/security/advisories/mfsa2017-03/

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