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CVE-2017-7803

21
FAUCET Score

CVE-2017-7803 describes a vulnerability where a Content Security Policy (CSP) header containing a "sandbox" directive causes other CSP directives to be ignored, leading to incorrect enforcement. This flaw impacts Mozilla Firefox, Firefox ESR, and Thunderbird versions prior to 55 and 52.3 respectively. With a CVSS score of 7.5 (High), this network-exploitable vulnerability allows for high integrity impact without requiring user interaction or complex attack conditions. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
6.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
6.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
7.4CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.03%
Probability of exploitation in next 30 days
EPSS Percentile
79.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0203 is in the 63rd percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

mozillapatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: firefox-0:52.3.0-3.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: thunderbird-0:52.3.0-1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox-0:52.3.0-2.el7_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: thunderbird-0:52.3.0-1.el7_4
View patch

Vendor Advisories (1)

redhatCVE-2017-7803Moderate

Mozilla: CSP directives improperly applied with sandbox flag in iframes (MFSA 2017-19)

Aug 8, 2017

References

access.redhat.com / errata/RHSA-2017:2456
Third Party Advisory
access.redhat.com / errata/RHSA-2017:2534
Third Party Advisory
bugzilla.mozilla.org / show_bug.cgi
ExploitIssue TrackingPatch
security.gentoo.org / glsa/201803-14
Third Party Advisory
debian.org / security/2017/dsa-3928
Third Party Advisory
debian.org / security/2017/dsa-3968
Third Party Advisory
mozilla.org / security/advisories/mfsa2017-18
Vendor Advisory
mozilla.org / security/advisories/mfsa2017-19
Vendor Advisory
mozilla.org / security/advisories/mfsa2017-20
Vendor Advisory
securityfocus.com / bid/100234
Third Party AdvisoryVDB Entry
securitytracker.com / id/1039124
Third Party AdvisoryVDB Entry