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CVE-2017-5376

31
FAUCET Score

CVE-2017-5376 is a critical use-after-free vulnerability in Mozilla Firefox, Firefox ESR, and Thunderbird, specifically affecting XSL manipulation in XSLT documents. This flaw carries a CVSS score of 9.8 (Critical), indicating it can be exploited remotely with low complexity, leading to complete compromise of confidentiality, integrity, and availability. Despite its high severity, there is no evidence of active exploitation, and no public exploit code or Metasploit modules are available, though it has received some media coverage and community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
5.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:5.0:*:*:*:*:*:*:*
6.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
5.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:*

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
3.21%
Probability of exploitation in next 30 days
EPSS Percentile
86.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0321 is in the 79th percentile among its peer group of 36,862 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 (7)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: firefox-0:45.7.0-2.el6_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:45.7.0-2.el5_11
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: thunderbird-0:45.7.0-1.el5_11
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: thunderbird-0:45.7.0-1.el7_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: thunderbird-0:45.7.0-1.el6_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox-0:45.7.0-2.el7_3
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2017-5376Critical

Mozilla: Use-after-free in XSL (MFSA 2017-02)

Jan 24, 2017

References

rhn.redhat.com / errata/RHSA-2017-0190.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2017-0238.html
Third Party Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingVendor Advisory
security.gentoo.org / glsa/201702-13
Third Party Advisory
security.gentoo.org / glsa/201702-22
Third Party Advisory
debian.org / security/2017/dsa-3771
Third Party Advisory
debian.org / security/2017/dsa-3832
Third Party Advisory
mozilla.org / security/advisories/mfsa2017-01
Vendor Advisory
mozilla.org / security/advisories/mfsa2017-02
Vendor Advisory
mozilla.org / security/advisories/mfsa2017-03
Vendor Advisory
securityfocus.com / bid/95758
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037693
Third Party AdvisoryVDB Entry