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No exploitation reportedFix available

CVE-2017-7807

No exploitation reported by the sources we read.

  • Published2018-06-11
  • WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A mechanism that uses AppCache to hijack a URL in a domain using fallback by serving the files from a sub-path on the domain. This has been addressed by requiring fallback files be inside the manifest directory. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

Timeline

dates in UTC
  1. 2018-06-1121:29CVE publishedNVD

Versions per branch

NVD
Redhat enterprise linux server eus
BranchAffectedFixed in
7.3= 7.3no fix published
7.4= 7.4no fix published
7.5= 7.5no fix published
Debian debian linux
BranchAffectedFixed in
8.0= 8.0no fix published
9.0= 9.0no fix published
Mozilla firefox
BranchAffectedFixed in
55.0< 55.055.0
52.3< 52.3.052.3.0

6 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • firefoxUbuntu:16.04:LTSall versions · fixed in 55.0.1+build2-0ubuntu0.16.04.2
  • firefoxUbuntu:14.04:LTSall versions · fixed in 55.0.1+build2-0ubuntu0.14.04.2
  • firefoxRed Hat:enterprise_linux:7::workstationall versions · fixed in 0:52.3.0-2.el7_4and 1 other package
  • firefoxRed Hat:enterprise_linux:7::serverall versions · fixed in 0:52.3.0-2.el7_4and 1 other package
  • firefoxRed Hat:enterprise_linux:7::clientall versions · fixed in 0:52.3.0-2.el7_4and 1 other package
  • firefoxRed Hat:enterprise_linux:6::workstationall versions · fixed in 0:52.3.0-3.el6_9and 1 other package
  • firefoxRed Hat:enterprise_linux:6::serverall versions · fixed in 0:52.3.0-3.el6_9and 1 other package
  • firefoxRed Hat:enterprise_linux:6::computenodeall versions · fixed in 0:52.3.0-3.el6_9and 1 other package

57 more package ranges on OSV.dev

Vendor advisories

  • CVE-2017-7807 Red Hat Product Security229 products fixed

    Mozilla: Domain hijacking through appcache fallback (MFSA 2017-19)

  • RHSA-2017:2534 Red Hat Product Security32 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2017:2456 Red Hat Product Security59 products fixed

    Red Hat Security Advisory: firefox security update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2017:2534 · 32 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
  2. Vendor fix Red Hat Product Security RHSA-2017:2456 · 59 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the update, Firefox must be restarted for the changes to take effect.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Published
2018-06-11
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-4g4m-5m32-4h55

Frequently asked questions

What is CVE-2017-7807?

A mechanism that uses AppCache to hijack a URL in a domain using fallback by serving the files from a sub-path on the domain. This has been addressed by requiring fallback files be inside the manifest directory. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

Is CVE-2017-7807 actively exploited?

Active exploitation of CVE-2017-7807 has not been confirmed. Its EPSS score was 2.1% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-7807?

CVE-2017-7807 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

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