SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2017-7803

This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

HIGH 7.5EPSS 2.00%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (2.00%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

When a page's content security policy (CSP) header contains a "sandbox" directive, other directives are ignored. This results in the incorrect enforcement of CSP. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

CVSS 3.0
7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS
2.00% probability · 80th percentile
CISA KEV
Not listed
Weakness
CWE-269
Affected
redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server eus · redhat/enterprise linux workstation · debian/debian linux · mozilla/firefox · mozilla/thunderbird
Source
security@mozilla.org

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.