high 8.8

CVE-2019-17005 json

The plain text serializer used a fixed-size array for the number of <ol> elements it could process; however it was possible to overflow the…

published 2020-01-08 6y ago modified 2026-06-17 4mo ago also EUVD-2019-7479

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.9%; EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits: 0; none known

The plain text serializer used a fixed-size array for the number of <ol> elements it could process; however it was possible to overflow the static-sized array leading to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.

Patch / fix

fixed in 3 distros 7

mozilla firefox 71.0
mozilla firefox_esr 68.3
mozilla thunderbird 68.3

debian ubuntu red hat suse opensuse alpine arch linux

firefox-esr Debian 14, Debian 13, Debian 12 68.3.0esr-1
thunderbird Debian 14, Debian 13, Debian 12 1:68.3.0-1

debian advisories DEBIAN-CVE-2019-17005

firefox Ubuntu 16.04 LTS 71.0+build5-0ubuntu0.16.04.1
firefox Ubuntu 18.04 LTS 71.0+build5-0ubuntu0.18.04.1
firefox Ubuntu 20.04 LTS 71.0+build5-0ubuntu1
thunderbird Ubuntu 16.04 LTS 1:68.7.0+build1-0ubuntu0.16.04.2
thunderbird Ubuntu 18.04 LTS 1:68.4.1+build1-0ubuntu0.18.04.1
thunderbird Ubuntu 20.04 LTS 1:68.3.0+build2-0ubuntu1

ubuntu advisories UBUNTU-CVE-2019-17005

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

thunderbird RHEL 6 68.3.0-3.el6_10
thunderbird RHEL 8 68.3.0-2.el8_1
thunderbird RHEL 7 68.3.0-1.el7_7
firefox RHEL 8 68.3.0-1.el8_1
firefox RHEL 7 68.3.0-1.el7_7
firefox RHEL 6 68.3.0-1.el6_10
firefox RHEL 8.0 E4S 68.4.1-1.el8_0
thunderbird RHEL 8.0 E4S 68.4.1-2.el8_0

red hat advisories RHSA-2020:0295 RHSA-2020:0292 RHSA-2019:4205 RHSA-2019:4195 RHSA-2019:4148 RHSA-2019:4111

MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +17 more 68.3.0-109.98.1
MozillaThunderbird SLE Workstation Extension 15 SP1, SLE Workstation Extension 15 68.3.0-3.61.2
MozillaFirefox SLE Module for Desktop Applications 15 SP1, SLE Module for Desktop Applications 15 68.3.0-3.62.2
mozilla-nss SLES 11 SP4-LTSS 3.47.1-38.12.1
mozilla-nspr SLES 11 SP4-LTSS 4.23-29.9.1
MozillaFirefox SLES 11 SP4-LTSS 68.3.0-78.54.1

suse advisories SUSE-SU-2019:14260-1 SUSE-SU-2019:3347-1 SUSE-SU-2019:3339-1 SUSE-SU-2019:3337-1

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
MozillaFirefox openSUSE Tumbleweed 92.0-1.2
MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
MozillaThunderbird openSUSE Leap 15.1 68.3.0-lp151.2.19.1
MozillaFirefox openSUSE Leap 15.1 68.3.0-lp151.2.21.1

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:10600-1 openSUSE-SU-2024:10601-1 openSUSE-SU-2020:0003-1 openSUSE-SU-2020:0002-1

firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +10 more 68.3.0-r0

alpine advisories ALPINE-CVE-2019-17005

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

firefox Arch Linux 71.0-1
thunderbird Arch Linux 68.3.0-1

arch linux advisories AVG-1071 AVG-1072

Is CVE-2019-17005 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-17005 updated 2026-11-05 cvss 8.8

Mozilla: Buffer overflow in plain text serializer

Red Hat Enterprise Linux 5 firefox, thunderbird
affected: no fix planned “Out of support scope”
Red Hat Enterprise Linux AppStream (v. 8) firefox 68.3.0-1.el8_1, thunderbird 68.3.0-2.el8_1
fixed: vendor fix RHSA-2019:4111
Red Hat Enterprise Linux AppStream E4S (v. 8.0) firefox 68.4.1-1.el8_0, thunderbird 68.4.1-2.el8_0
fixed: vendor fix RHSA-2020:0295
Red Hat Enterprise Linux Client (v. 7) firefox 68.3.0-1.el7_7, thunderbird 68.3.0-1.el7_7 Red Hat Enterprise Linux Client Optional (v. 7) firefox 68.3.0-1.el7_7
fixed: vendor fix RHSA-2019:4107
Red Hat Enterprise Linux Desktop (v. 6) firefox 68.3.0-1.el6_10, thunderbird 68.3.0-3.el6_10 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 68.3.0-1.el6_10 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 68.3.0-1.el6_10 Red Hat Enterprise Linux Server (v. 6) firefox 68.3.0-1.el6_10
fixed: vendor fix RHSA-2019:4108
Red Hat Enterprise Linux Server (v. 7) firefox 68.3.0-1.el7_7
fixed: vendor fix RHSA-2019:4107
Red Hat Enterprise Linux Server Optional (v. 6) firefox 68.3.0-1.el6_10, thunderbird 68.3.0-3.el6_10
fixed: vendor fix RHSA-2019:4108
Red Hat Enterprise Linux Server Optional (v. 7) firefox 68.3.0-1.el7_7, thunderbird 68.3.0-1.el7_7
fixed: vendor fix RHSA-2019:4107

show 4 more

Red Hat Enterprise Linux Workstation (v. 6) firefox 68.3.0-1.el6_10, thunderbird 68.3.0-3.el6_10
fixed: vendor fix RHSA-2019:4108
Red Hat Enterprise Linux Workstation (v. 7) firefox 68.3.0-1.el7_7, thunderbird 68.3.0-1.el7_7
fixed: vendor fix RHSA-2019:4107
Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 68.3.0-1.el6_10
fixed: vendor fix RHSA-2019:4108
Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 68.3.0-1.el7_7
fixed: vendor fix RHSA-2019:4107

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.91% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1584170 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

Mozilla Thunderbird
Mozilla Firefox ESR
Mozilla Firefox

Classification

Weakness

CWE-787 Out-of-bounds Write

References

bugzilla.mozilla.org /show_bug.cgi?id=1584170
exploit, issue-tracking, vendor-advisory
lists.opensuse.org /opensuse-security-announce/2020-01/msg00000.html
vendor-advisory, issue-tracking, third-party-advisory
lists.opensuse.org /opensuse-security-announce/2020-01/msg00001.html
vendor-advisory, issue-tracking, third-party-advisory
usn.ubuntu.com /4241-1/
vendor-advisory, third-party-advisory
access.redhat.com /errata/RHSA-2020:0292
vendor-advisory, third-party-advisory
access.redhat.com /errata/RHSA-2020:0295
vendor-advisory, third-party-advisory
security.gentoo.org /glsa/202003-02
vendor-advisory, third-party-advisory
security.gentoo.org /glsa/202003-10
vendor-advisory, third-party-advisory
usn.ubuntu.com /4335-1/
vendor-advisory, third-party-advisory
mozilla.org /security/advisories/mfsa2019-36/
vendor-advisory
mozilla.org /security/advisories/mfsa2019-38/
vendor-advisory
mozilla.org /security/advisories/mfsa2019-37/
vendor-advisory

Sources

CVE List CVE-2019-17005
NVD CVE-2019-17005

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

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