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CVE-2017-7779

32
FAUCET Score

CVE-2017-7779 describes memory safety bugs in Firefox, Firefox ESR, and Thunderbird versions prior to 55 and 52.3 respectively. These bugs could lead to memory corruption, potentially allowing for arbitrary code execution. With a CVSS score of 9.8 (CRITICAL) and a FAUCET Risk Score of 93/100, this vulnerability is easily exploitable over the network with no user interaction, leading to high impacts on confidentiality, integrity, and availability. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion with 11 mentions, indicating notable attention.

Impacted Technologies

VendorProductVersion(s)CPE
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.70%
Probability of exploitation in next 30 days
EPSS Percentile
84.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0270 is in the 75th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

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
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2017-7779Critical

Mozilla: Memory safety bugs fixed in Firefox 55 and Firefox ESR 52.3 (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 / buglist.cgi
Issue TrackingPermissions RequiredThird Party Advisory
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/100201
Third Party AdvisoryVDB Entry
securitytracker.com / id/1039124
Third Party AdvisoryVDB Entry