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CVE-2017-7826

28
FAUCET Score

CVE-2017-7826 describes multiple memory safety bugs in Firefox, Firefox ESR, and Thunderbird, affecting versions prior to 57, 52.5, and 52.5 respectively. This critical vulnerability, rated 9.8 CVSS, allows for remote, low-complexity exploitation without user interaction, potentially leading to arbitrary code execution and complete compromise of confidentiality, integrity, and availability. Despite its high severity, there is no public exploit code available (Metasploit, Nuclei, ExploitDB), it is not listed in the KEV catalog, and it has received no community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
7.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*

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
3.34%
Probability of exploitation in next 30 days
EPSS Percentile
87.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0334 is in the 79th percentile among its peer group of 36,897 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

No media coverage found for this CVE.

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-0:52.5.0-1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: thunderbird-0:52.5.0-1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox-0:52.5.0-1.el7_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: thunderbird-0:52.5.0-1.el7_4
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2017-7826Critical

Mozilla: Memory safety bugs fixed in Firefox 57 and Firefox ESR 52.5 (MFSA 2017-25)

Nov 15, 2017

References

access.redhat.com / errata/RHSA-2017:3247
Third Party Advisory
access.redhat.com / errata/RHSA-2017:3372
Third Party Advisory
bugzilla.mozilla.org / buglist.cgi
Issue TrackingPermissions RequiredThird Party Advisory
lists.debian.org / debian-lts-announce/2017/11/msg00018.html
Third Party Advisory
lists.debian.org / debian-lts-announce/2017/12/msg00001.html
Third Party Advisory
usn.ubuntu.com / 3688-1
Third Party Advisory
debian.org / security/2017/dsa-4035
Third Party Advisory
debian.org / security/2017/dsa-4061
Third Party Advisory
debian.org / security/2017/dsa-4075
Third Party Advisory
mozilla.org / security/advisories/mfsa2017-24
Vendor Advisory
mozilla.org / security/advisories/mfsa2017-25
Vendor Advisory
mozilla.org / security/advisories/mfsa2017-26
Vendor Advisory
securityfocus.com / bid/101832
Third Party AdvisoryVDB Entry
securitytracker.com / id/1039803
Third Party AdvisoryVDB Entry