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CVE-2016-5296

26
FAUCET Score

CVE-2016-5296 describes a heap-buffer-overflow vulnerability in Cairo, triggered by compiler optimization when processing SVG content, which can lead to an exploitable crash. This flaw impacts Thunderbird < 45.5, Firefox ESR < 45.5, and Firefox < 50. With a CVSS score of 7.5 (HIGH), it presents a significant risk as it can be exploited remotely without user interaction, potentially leading to a denial of service. While no public exploit code or active exploitation has been confirmed, the vulnerability has garnered notable community discussion and media coverage, indicating awareness within the security community.

Impacted Technologies

VendorProductVersion(s)CPE
< 45.5.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
< 50.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
< 45.5.0CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

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:N/A:H

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

Exploit Intelligence

EPSS Score
3.50%
Probability of exploitation in next 30 days
EPSS Percentile
87.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0350 is in the 79th 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

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 (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:45.5.0-1.el5_11
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: firefox-0:45.5.0-1.el6_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox-0:45.5.0-1.el7_3
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2016-5296Critical

Mozilla: Heap-buffer-overflow WRITE in rasterize_edges_1 (MFSA 2016-89, MFSA 2016-90)

Nov 16, 2016

References

rhn.redhat.com / errata/RHSA-2016-2780.html
Third Party Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingVendor Advisory
security.gentoo.org / glsa/201701-15
Third Party Advisory
debian.org / security/2016/dsa-3730
Third Party Advisory
mozilla.org / security/advisories/mfsa2016-89
Vendor Advisory
mozilla.org / security/advisories/mfsa2016-90
Vendor Advisory
mozilla.org / security/advisories/mfsa2016-93
Vendor Advisory
securityfocus.com / bid/94339
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037298
Third Party AdvisoryVDB Entry