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CVE-2017-7814
File downloads encoded with "blob:" and "data:" URL elements bypassed normal file download checks though the Phishing and Malware…
High7.8EPSS 1.2%
- Published
- Updated
- Reserved
- Assigned by
- mozilla
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | High7.8 | CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 1.2% · top 32% of all CVEs (4 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
- Blob and data URLs bypass phishing and malware protection warnings
- CWE-20 (opens in a new tab)All about CWE-20 and its CVEs
Affected products
- affected unspecified – < 56
- affected unspecified – < 52.4
- affected unspecified – < 52.4
References (12)
- 101059 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- [debian-lts-announce] 20171101 [SECURITY] [DLA 1153-1] icedove/thunderbird security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://www.mozilla.org/security/advisories/mfsa2017-22/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- 1039465 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- RHSA-2017:2831 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2017:2885 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://www.mozilla.org/security/advisories/mfsa2017-21/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://bugzilla.mozilla.org/show_bug.cgi?id=1376036 (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-4014 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- https://www.mozilla.org/security/advisories/mfsa2017-23/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-3987 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- GLSA-201803-14 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2017-7814)Record last updated .