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CVE-2016-9898

25
FAUCET Score

CVE-2016-9898 is a critical use-after-free vulnerability in the DOM editor of Firefox, Firefox ESR, and Thunderbird versions prior to 50.1 and 45.6 respectively. With a CVSS score of 9.8, this vulnerability allows for remote, low-complexity attacks without user interaction, potentially leading to complete compromise of confidentiality, integrity, and availability. While highly severe, there is currently no known active exploitation, public exploit code, or significant community discussion surrounding this CVE.

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
3.56%
Probability of exploitation in next 30 days
EPSS Percentile
88.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0356 is in the 80th percentile among its peer group of 36,835 CVEs.

Social Chatter

No social media mentions found for this CVE.

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 (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:45.6.0-1.el5_11
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: firefox-0:45.6.0-1.el6_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox-0:45.6.0-1.el7_3
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2016-9898Moderate

Mozilla: Use-after-free in Editor while manipulating DOM subtrees (MFSA 2016-94, MFSA 2016-95)

Dec 14, 2016

References

rhn.redhat.com / errata/RHSA-2016-2946.html
Third Party Advisory
bugzilla.mozilla.org / show_bug.cgi
ExploitIssue TrackingVendor Advisory
security.gentoo.org / glsa/201701-15
Third Party Advisory
debian.org / security/2017/dsa-3757
Third Party Advisory
mozilla.org / security/advisories/mfsa2016-94
Vendor Advisory
mozilla.org / security/advisories/mfsa2016-95
Vendor Advisory
mozilla.org / security/advisories/mfsa2016-96
Vendor Advisory
securityfocus.com / bid/94885
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037461
Third Party AdvisoryVDB Entry