What’s Vulnerable › Vulnerabilities
CVE-2017-7814
- Severity: high (CVSS 7.8 v3.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.2% 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-20
Description
File downloads encoded with "blob:" and "data:" URL elements bypassed normal file download checks though the Phishing and Malware Protection feature and its block lists of suspicious sites and files. This would allow malicious sites to lure users into downloading executables that would otherwise be detected as suspicious. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
Affected products
- Debian Linux: 7.0, 8.0, 9.0
- Mozilla Firefox: before 52.4.0; before 56.0 — fixed in 52.4.0, 56.0
- Mozilla Thunderbird: before 52.4.0 — fixed in 52.4.0
- RedHat Enterprise Linux Desktop: 6.0, 7.0
- RedHat Enterprise Linux Server: 6.0, 7.0
- RedHat Enterprise Linux Server Aus: 7.4
- RedHat Enterprise Linux Server Eus: 7.4, 7.5
- RedHat Enterprise Linux Workstation: 6.0, 7.0
How to fix
Upgrade to a fixed version: Mozilla Firefox 52.4.0, 56.0; Mozilla Thunderbird 52.4.0. Check the vendor advisory for mitigations.
References
- http://www.securityfocus.com/bid/101059
- http://www.securitytracker.com/id/1039465
- https://access.redhat.com/errata/RHSA-2017:2831
- https://access.redhat.com/errata/RHSA-2017:2885
- https://bugzilla.mozilla.org/show_bug.cgi?id=1376036
- https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html
- https://security.gentoo.org/glsa/201803-14
- https://www.debian.org/security/2017/dsa-3987
- https://www.debian.org/security/2017/dsa-4014
- https://www.mozilla.org/security/advisories/mfsa2017-21/
- https://www.mozilla.org/security/advisories/mfsa2017-22/
- https://www.mozilla.org/security/advisories/mfsa2017-23/
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