CVE-2013-1720

The nsHtml5TreeBuilder::resetTheInsertionMode function in the HTML5 Tree Builder in Mozilla Firefox before 24.0, Thunderbird before 24.0, and SeaMonkey before 2.21 does not properly maintain the state of the insertion-mode stack for template elements, which allows remote attackers to execute arbitrary code or cause a denial of service (heap-based buffer over-read) by triggering use of this stack in its empty state.

Published: 2013-09-18 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-1720 is rated Moderate Risk (59.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 3.99%). EPSS rose +1.30% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2013-1720

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 2.69% 3.99% +1.30%
2 2026-03-22 1.94% 2.69% +0.75%
3 2025-07-09 — 1.94% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-1720

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2013-1720

OS Trackers for CVE-2013-1720

vendor priority summary link
gentoo high CVE-2013-1720: 1 GLSA(s) (201309-23), 6 atom(s) (mail-client/thunderbird, mail-client/thunderbird-bin, www-client/firefox, www-client/firefox-bin, www-client/seamonkey, www-client/seamonkey-bin); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-1720
redhat medium — https://access.redhat.com/security/cve/CVE-2013-1720
suse medium CVE-2013-1720 severity moderate: SUSE including 59 source package names (MozillaFirefox-140.2.0-160000.1.2, MozillaFirefox-31.1.0esr-1.20, …), 75 product×package rows across 26 product lines (SUSE Linux Enterprise Desktop 12, SUSE Linux Enterprise Desktop 12 SP1, … (26 product lines)): Fixed 75. https://www.suse.com/security/cve/CVE-2013-1720/
ubuntu medium CVE-2013-1720 medium priority: Ubuntu including 2 source packages (firefox, thunderbird), 10 status rows across 5 suites (lucid, precise, quantal, raring, upstream): released 8, ignored 2. https://ubuntu.com/security/CVE-2013-1720

Affected software / configurations for CVE-2013-1720

Vendor Product Version Raw CPE
mozilla firefox <= 23.0.1 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla firefox 19.0 cpe:2.3:a:mozilla:firefox:19.0:*:*:*:*:*:*:*
mozilla firefox 19.0.1 cpe:2.3:a:mozilla:firefox:19.0.1:*:*:*:*:*:*:*
mozilla firefox 19.0.2 cpe:2.3:a:mozilla:firefox:19.0.2:*:*:*:*:*:*:*
mozilla firefox 20.0 cpe:2.3:a:mozilla:firefox:20.0:*:*:*:*:*:*:*
mozilla firefox 20.0.1 cpe:2.3:a:mozilla:firefox:20.0.1:*:*:*:*:*:*:*
mozilla firefox 21.0 cpe:2.3:a:mozilla:firefox:21.0:*:*:*:*:*:*:*
mozilla firefox 22.0 cpe:2.3:a:mozilla:firefox:22.0:*:*:*:*:*:*:*
mozilla firefox 23.0 cpe:2.3:a:mozilla:firefox:23.0:*:*:*:*:*:*:*
mozilla thunderbird <= 17.0.9 cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
mozilla thunderbird 17.0 cpe:2.3:a:mozilla:thunderbird:17.0:*:*:*:*:*:*:*
mozilla thunderbird 17.0.1 cpe:2.3:a:mozilla:thunderbird:17.0.1:*:*:*:*:*:*:*
mozilla thunderbird 17.0.2 cpe:2.3:a:mozilla:thunderbird:17.0.2:*:*:*:*:*:*:*
mozilla thunderbird 17.0.3 cpe:2.3:a:mozilla:thunderbird:17.0.3:*:*:*:*:*:*:*
mozilla thunderbird 17.0.4 cpe:2.3:a:mozilla:thunderbird:17.0.4:*:*:*:*:*:*:*
mozilla thunderbird 17.0.5 cpe:2.3:a:mozilla:thunderbird:17.0.5:*:*:*:*:*:*:*
mozilla thunderbird 17.0.6 cpe:2.3:a:mozilla:thunderbird:17.0.6:*:*:*:*:*:*:*
mozilla thunderbird 17.0.7 cpe:2.3:a:mozilla:thunderbird:17.0.7:*:*:*:*:*:*:*
mozilla thunderbird 17.0.8 cpe:2.3:a:mozilla:thunderbird:17.0.8:*:*:*:*:*:*:*
mozilla seamonkey <= 2.20 cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
mozilla seamonkey 2.0 cpe:2.3:a:mozilla:seamonkey:2.0:*:*:*:*:*:*:*
mozilla seamonkey 2.0 cpe:2.3:a:mozilla:seamonkey:2.0:alpha_1:*:*:*:*:*:*
mozilla seamonkey 2.0 cpe:2.3:a:mozilla:seamonkey:2.0:alpha_2:*:*:*:*:*:*
mozilla seamonkey 2.0 cpe:2.3:a:mozilla:seamonkey:2.0:alpha_3:*:*:*:*:*:*
mozilla seamonkey 2.0 cpe:2.3:a:mozilla:seamonkey:2.0:beta_1:*:*:*:*:*:*
mozilla seamonkey 2.0 cpe:2.3:a:mozilla:seamonkey:2.0:beta_2:*:*:*:*:*:*
mozilla seamonkey 2.0 cpe:2.3:a:mozilla:seamonkey:2.0:rc1:*:*:*:*:*:*
mozilla seamonkey 2.0 cpe:2.3:a:mozilla:seamonkey:2.0:rc2:*:*:*:*:*:*
mozilla seamonkey 2.0.1 cpe:2.3:a:mozilla:seamonkey:2.0.1:*:*:*:*:*:*:*
mozilla seamonkey 2.0.2 cpe:2.3:a:mozilla:seamonkey:2.0.2:*:*:*:*:*:*:*
mozilla seamonkey 2.0.3 cpe:2.3:a:mozilla:seamonkey:2.0.3:*:*:*:*:*:*:*
mozilla seamonkey 2.0.4 cpe:2.3:a:mozilla:seamonkey:2.0.4:*:*:*:*:*:*:*
mozilla seamonkey 2.0.5 cpe:2.3:a:mozilla:seamonkey:2.0.5:*:*:*:*:*:*:*
mozilla seamonkey 2.0.6 cpe:2.3:a:mozilla:seamonkey:2.0.6:*:*:*:*:*:*:*
mozilla seamonkey 2.0.7 cpe:2.3:a:mozilla:seamonkey:2.0.7:*:*:*:*:*:*:*
mozilla seamonkey 2.0.8 cpe:2.3:a:mozilla:seamonkey:2.0.8:*:*:*:*:*:*:*
mozilla seamonkey 2.0.9 cpe:2.3:a:mozilla:seamonkey:2.0.9:*:*:*:*:*:*:*
mozilla seamonkey 2.0.10 cpe:2.3:a:mozilla:seamonkey:2.0.10:*:*:*:*:*:*:*
mozilla seamonkey 2.0.11 cpe:2.3:a:mozilla:seamonkey:2.0.11:*:*:*:*:*:*:*
mozilla seamonkey 2.0.12 cpe:2.3:a:mozilla:seamonkey:2.0.12:*:*:*:*:*:*:*
mozilla seamonkey 2.0.13 cpe:2.3:a:mozilla:seamonkey:2.0.13:*:*:*:*:*:*:*
mozilla seamonkey 2.0.14 cpe:2.3:a:mozilla:seamonkey:2.0.14:*:*:*:*:*:*:*
mozilla seamonkey 2.1 cpe:2.3:a:mozilla:seamonkey:2.1:*:*:*:*:*:*:*
mozilla seamonkey 2.1 cpe:2.3:a:mozilla:seamonkey:2.1:alpha1:*:*:*:*:*:*
mozilla seamonkey 2.1 cpe:2.3:a:mozilla:seamonkey:2.1:alpha2:*:*:*:*:*:*
mozilla seamonkey 2.1 cpe:2.3:a:mozilla:seamonkey:2.1:alpha3:*:*:*:*:*:*
mozilla seamonkey 2.1 cpe:2.3:a:mozilla:seamonkey:2.1:beta1:*:*:*:*:*:*
mozilla seamonkey 2.1 cpe:2.3:a:mozilla:seamonkey:2.1:beta2:*:*:*:*:*:*
mozilla seamonkey 2.1 cpe:2.3:a:mozilla:seamonkey:2.1:beta3:*:*:*:*:*:*
mozilla seamonkey 2.1 cpe:2.3:a:mozilla:seamonkey:2.1:rc1:*:*:*:*:*:*
mozilla seamonkey 2.1 cpe:2.3:a:mozilla:seamonkey:2.1:rc2:*:*:*:*:*:*
mozilla seamonkey 2.10 cpe:2.3:a:mozilla:seamonkey:2.10:*:*:*:*:*:*:*
mozilla seamonkey 2.10 cpe:2.3:a:mozilla:seamonkey:2.10:beta1:*:*:*:*:*:*
mozilla seamonkey 2.10 cpe:2.3:a:mozilla:seamonkey:2.10:beta2:*:*:*:*:*:*
mozilla seamonkey 2.10 cpe:2.3:a:mozilla:seamonkey:2.10:beta3:*:*:*:*:*:*
mozilla seamonkey 2.10.1 cpe:2.3:a:mozilla:seamonkey:2.10.1:*:*:*:*:*:*:*
mozilla seamonkey 2.11 cpe:2.3:a:mozilla:seamonkey:2.11:*:*:*:*:*:*:*
mozilla seamonkey 2.11 cpe:2.3:a:mozilla:seamonkey:2.11:beta1:*:*:*:*:*:*
mozilla seamonkey 2.11 cpe:2.3:a:mozilla:seamonkey:2.11:beta2:*:*:*:*:*:*
mozilla seamonkey 2.11 cpe:2.3:a:mozilla:seamonkey:2.11:beta3:*:*:*:*:*:*
mozilla seamonkey 2.11 cpe:2.3:a:mozilla:seamonkey:2.11:beta4:*:*:*:*:*:*
mozilla seamonkey 2.11 cpe:2.3:a:mozilla:seamonkey:2.11:beta5:*:*:*:*:*:*
mozilla seamonkey 2.11 cpe:2.3:a:mozilla:seamonkey:2.11:beta6:*:*:*:*:*:*
mozilla seamonkey 2.12 cpe:2.3:a:mozilla:seamonkey:2.12:*:*:*:*:*:*:*
mozilla seamonkey 2.12 cpe:2.3:a:mozilla:seamonkey:2.12:beta1:*:*:*:*:*:*
mozilla seamonkey 2.12 cpe:2.3:a:mozilla:seamonkey:2.12:beta2:*:*:*:*:*:*
mozilla seamonkey 2.12 cpe:2.3:a:mozilla:seamonkey:2.12:beta3:*:*:*:*:*:*
mozilla seamonkey 2.12 cpe:2.3:a:mozilla:seamonkey:2.12:beta4:*:*:*:*:*:*
mozilla seamonkey 2.12 cpe:2.3:a:mozilla:seamonkey:2.12:beta5:*:*:*:*:*:*
mozilla seamonkey 2.12 cpe:2.3:a:mozilla:seamonkey:2.12:beta6:*:*:*:*:*:*
mozilla seamonkey 2.12.1 cpe:2.3:a:mozilla:seamonkey:2.12.1:*:*:*:*:*:*:*
mozilla seamonkey 2.13 cpe:2.3:a:mozilla:seamonkey:2.13:*:*:*:*:*:*:*
mozilla seamonkey 2.13 cpe:2.3:a:mozilla:seamonkey:2.13:beta1:*:*:*:*:*:*
mozilla seamonkey 2.13 cpe:2.3:a:mozilla:seamonkey:2.13:beta2:*:*:*:*:*:*
mozilla seamonkey 2.13 cpe:2.3:a:mozilla:seamonkey:2.13:beta3:*:*:*:*:*:*
mozilla seamonkey 2.13 cpe:2.3:a:mozilla:seamonkey:2.13:beta4:*:*:*:*:*:*
mozilla seamonkey 2.13 cpe:2.3:a:mozilla:seamonkey:2.13:beta5:*:*:*:*:*:*
mozilla seamonkey 2.13 cpe:2.3:a:mozilla:seamonkey:2.13:beta6:*:*:*:*:*:*
mozilla seamonkey 2.13.1 cpe:2.3:a:mozilla:seamonkey:2.13.1:*:*:*:*:*:*:*
mozilla seamonkey 2.13.2 cpe:2.3:a:mozilla:seamonkey:2.13.2:*:*:*:*:*:*:*

References for CVE-2013-1720

URL Tags
http://lists.fedoraproject.org/pipermail/package-announce/2013-September/115907.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-September/116610.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-September/117526.html
http://lists.opensuse.org/opensuse-updates/2013-09/msg00055.html
http://lists.opensuse.org/opensuse-updates/2013-09/msg00057.html
http://lists.opensuse.org/opensuse-updates/2013-09/msg00059.html
http://lists.opensuse.org/opensuse-updates/2013-09/msg00061.html
http://www.mozilla.org/security/announce/2013/mfsa2013-77.html Vendor Advisory
http://www.securityfocus.com/bid/62465
http://www.ubuntu.com/usn/USN-1951-1
http://www.ubuntu.com/usn/USN-1952-1
https://bugzilla.mozilla.org/show_bug.cgi?id=888820
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18617
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