CVE-2016-2819Firefox Memory Corruption
Heap-based buffer overflow in Mozilla Firefox before 47.0 and Firefox ESR 45.x before 45.2 allows remote attackers to execute arbitrary code via foreign-context HTML5 fragments, as demonstrated by fragments within an SVG element.
Published Jun 13, 2016 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2016-2819, UBUNTU-CVE-2016-2819
Key Facts
Patch immediately- CVE-2016-2819 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Firefox (Mozilla), Ubuntu Linux (Canonical), Debian Linux and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. A public exploit is reported by tracking sources, but no code link is listed yet.
- EPSS estimates a 24% probability of exploitation in the next 30 days.
- Fixed versions are available, including Firefox 0:45.2.0-1.el5_11, Firefox 0:45.2.0-1.el6_8, Firefox 0:45.2.0-1.el7_2.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v3.1
8.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
24%
Higher than 97.8% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
40/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
Description
Heap-based buffer overflow in Mozilla Firefox before 47.0 and Firefox ESR 45.x before 45.2 allows remote attackers to execute arbitrary code via foreign-context HTML5 fragments, as demonstrated by fragments within an SVG element.
Affected Products
381 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| FirefoxMozilla | 45.1.0, 45.1.1 | 46.0.1 |
| Ubuntu LinuxCanonical | 12.04, 14.04, 15.10, 16.04 | n/a |
| Debian LinuxDebian | 8.0 | n/a |
| LeapOpensuse | 42.1 | n/a |
| OpensuseOpensuse | 13.1, 13.2 | n/a |
Patched Releases
Firefox
0:45.2.0-1.el5_11, 0:45.2.0-1.el6_8, 0:45.2.0-1.el7_2, 45.2.0-1.0.1.el5_11, 45.2.0-1.0.1.el6_8, 45.2.0-1.0.1.el7_2, 47.0-1, 47.0+build3-0ubuntu0.14.04.1, 47.0+build3-0ubuntu0.16.04.1, 46.0.1
firefox-esr
128.5.1-1.1, 45.2.0esr-1, 45.2.0esr-1~deb7u1, 45.2.0esr-1~deb8u1
firefox-esr-branding-upstream
128.5.1-1.1
firefox-esr-translations-common
128.5.1-1.1
firefox-esr-translations-other
128.5.1-1.1
firefox-fontconfig
2.11.0-2.1, 2.11.0-4.2
firefox-fontconfig-devel
2.11.0-2.1
libfreebl3
3.21.1-26.2, 3.21.1-35.1, 3.21.1-46.2, 3.23-18.1
libfreebl3-32bit
3.21.1-26.2, 3.21.1-35.1, 3.21.1-46.2, 3.23-18.1
libfreebl3-hmac
3.21.1-46.2
libfreebl3-hmac-32bit
3.21.1-46.2
libfreebl3-x86
3.21.1-35.1
libsoftokn3
3.21.1-35.1, 3.21.1-46.2, 3.23-18.1
libsoftokn3-32bit
3.21.1-35.1, 3.21.1-46.2, 3.23-18.1
libsoftokn3-hmac
3.21.1-46.2
libsoftokn3-hmac-32bit
3.21.1-46.2
libsoftokn3-x86
3.21.1-35.1
mozilla-nspr
4.12-15.2, 4.12-25.2, 4.12-29.1
mozilla-nspr-32bit
4.12-15.2, 4.12-25.2, 4.12-29.1
mozilla-nspr-devel
4.12-15.2, 4.12-25.2, 4.12-29.1
mozilla-nspr-x86
4.12-29.1
mozilla-nss
3.21.1-26.2, 3.21.1-35.1, 3.21.1-46.2, 3.23-18.1
mozilla-nss-32bit
3.21.1-26.2, 3.21.1-35.1, 3.21.1-46.2, 3.23-18.1
mozilla-nss-certs
3.21.1-46.2, 3.23-18.1
mozilla-nss-certs-32bit
3.21.1-46.2, 3.23-18.1
Timeline
Publicly disclosed
Jun 13, 2016
Last updated
Aug 4, 2026
Weakness Type
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
References
- advisorysecurity-tracker.debian.org · CVE-2016-2819
- advisoryubuntu.com · CVE-2016-2819
- advisorycve.org · CVERecord
- advisoryRHSA-2016:1217
- advisorybugzilla.suse.com · 982366
FAQ
Common Questions.
Heap-based buffer overflow in Mozilla Firefox before 47.0 and Firefox ESR 45.x before 45.2 allows remote attackers to execute arbitrary code via foreign-context HTML5 fragments, as demonstrated by fragments within an SVG element.
Affected: Firefox (Mozilla) versions 45.1.0, 45.1.1; Ubuntu Linux (Canonical) versions 12.04, 14.04, 15.10, 16.04; Debian Linux versions 8.0, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
A public exploit is reported by tracking sources, but no code link is listed yet.
Fixed versions are available, including Firefox 0:45.2.0-1.el5_11, Firefox 0:45.2.0-1.el6_8, Firefox 0:45.2.0-1.el7_2.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
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