CVE-2010-3765

Exp

Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x before 2.0.10, when JavaScript is enabled, allows remote attackers to execute arbitrary code via vectors related to nsCSSFrameConstructor::ContentAppended, the appendChild method, incorrect index tracking, and the creation of multiple frames, which triggers memory corruption, as exploited in the wild in October 2010 by the Belmoo malware.

Published: 2010-10-28 Last update: 2026-04-22 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2010-3765 is rated Critical Active Threat (95.6/100): CVSS Critical severity, with high exploitation likelihood (EPSS 83.28%, 100th percentile). CISA KEV confirms active exploitation (added 2025-10-06) affecting Mozilla / Multiple Products. a weakness (CWE-119) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

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

CISA KEV Record for CVE-2010-3765

Name: Mozilla Multiple Products Remote Code Execution Vulnerability · CISA KEV detail

Exploit added: 2025-10-06

Action due: 2025-10-27

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Public exploit references (Exploit-DB) for CVE-2010-3765

EDB-ID Source Kind Published Link
16509 exploit_db edb 2011-02-22 Exploit-DB ↗
15352 exploit_db edb 2010-10-29 Exploit-DB ↗
15342 exploit_db edb 2010-10-28 Exploit-DB ↗
15341 exploit_db edb 2010-10-28 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2010-3765

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 86.77% 83.28% -3.49%
2 2026-05-17 86.62% 86.77% +0.15%
3 2026-04-23 — 86.62% —

Full EPSS history (29 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2010-3765

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0
9.3 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C 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:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 10.0 [email protected]

Weakness enumeration for CVE-2010-3765

OS Trackers for CVE-2010-3765

vendor priority summary link
gentoo high CVE-2010-3765: 1 GLSA(s) (201301-01), 14 atom(s) (dev-libs/nss, mail-client/mozilla-thunderbird, …); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2010-3765
redhat critical — https://access.redhat.com/security/cve/CVE-2010-3765
suse critical CVE-2010-3765 severity critical: SUSE including 117 source package names (MozillaFirefox-10.0-0.3.2, MozillaFirefox-140.2.0-160000.1.2, …), 184 product×package rows across 33 product lines (SUSE Linux Enterprise Desktop 12, SUSE Linux Enterprise Desktop 12 SP1, … (33 product lines)): Fixed 184. https://www.suse.com/security/cve/CVE-2010-3765/
ubuntu high CVE-2010-3765 high priority: Ubuntu including 6 source packages (firefox, firefox-3.0, firefox-3.5, seamonkey, thunderbird, xulrunner-1.9.2), 36 status rows across 6 suites (dapper, hardy, karmic, lucid, maverick, upstream): released 20, DNE 12, ignored 2, needs-triage 2. https://ubuntu.com/security/CVE-2010-3765

Affected software / configurations for CVE-2010-3765

Vendor Product Version Raw CPE
mozilla firefox 3.5 cpe:2.3:a:mozilla:firefox:3.5:*:*:*:*:*:*:*
mozilla firefox 3.5.1 cpe:2.3:a:mozilla:firefox:3.5.1:*:*:*:*:*:*:*
mozilla firefox 3.5.2 cpe:2.3:a:mozilla:firefox:3.5.2:*:*:*:*:*:*:*
mozilla firefox 3.5.3 cpe:2.3:a:mozilla:firefox:3.5.3:*:*:*:*:*:*:*
mozilla firefox 3.5.4 cpe:2.3:a:mozilla:firefox:3.5.4:*:*:*:*:*:*:*
mozilla firefox 3.5.5 cpe:2.3:a:mozilla:firefox:3.5.5:*:*:*:*:*:*:*
mozilla firefox 3.5.6 cpe:2.3:a:mozilla:firefox:3.5.6:*:*:*:*:*:*:*
mozilla firefox 3.5.7 cpe:2.3:a:mozilla:firefox:3.5.7:*:*:*:*:*:*:*
mozilla firefox 3.5.8 cpe:2.3:a:mozilla:firefox:3.5.8:*:*:*:*:*:*:*
mozilla firefox 3.5.9 cpe:2.3:a:mozilla:firefox:3.5.9:*:*:*:*:*:*:*
mozilla firefox 3.5.10 cpe:2.3:a:mozilla:firefox:3.5.10:*:*:*:*:*:*:*
mozilla firefox 3.5.11 cpe:2.3:a:mozilla:firefox:3.5.11:*:*:*:*:*:*:*
mozilla firefox 3.5.12 cpe:2.3:a:mozilla:firefox:3.5.12:*:*:*:*:*:*:*
mozilla firefox 3.5.13 cpe:2.3:a:mozilla:firefox:3.5.13:*:*:*:*:*:*:*
mozilla firefox 3.5.14 cpe:2.3:a:mozilla:firefox:3.5.14:*:*:*:*:*:*:*
mozilla firefox 3.6 cpe:2.3:a:mozilla:firefox:3.6:*:*:*:*:*:*:*
mozilla firefox 3.6.2 cpe:2.3:a:mozilla:firefox:3.6.2:*:*:*:*:*:*:*
mozilla firefox 3.6.3 cpe:2.3:a:mozilla:firefox:3.6.3:*:*:*:*:*:*:*
mozilla firefox 3.6.4 cpe:2.3:a:mozilla:firefox:3.6.4:*:*:*:*:*:*:*
mozilla firefox 3.6.6 cpe:2.3:a:mozilla:firefox:3.6.6:*:*:*:*:*:*:*
mozilla firefox 3.6.7 cpe:2.3:a:mozilla:firefox:3.6.7:*:*:*:*:*:*:*
mozilla firefox 3.6.8 cpe:2.3:a:mozilla:firefox:3.6.8:*:*:*:*:*:*:*
mozilla firefox 3.6.9 cpe:2.3:a:mozilla:firefox:3.6.9:*:*:*:*:*:*:*
mozilla firefox 3.6.10 cpe:2.3:a:mozilla:firefox:3.6.10:*:*:*:*:*:*:*
mozilla firefox 3.6.11 cpe:2.3:a:mozilla:firefox:3.6.11:*:*:*:*:*:*:*
mozilla thunderbird 3.0.1 cpe:2.3:a:mozilla:thunderbird:3.0.1:*:*:*:*:*:*:*
mozilla thunderbird 3.0.2 cpe:2.3:a:mozilla:thunderbird:3.0.2:*:*:*:*:*:*:*
mozilla thunderbird 3.0.3 cpe:2.3:a:mozilla:thunderbird:3.0.3:*:*:*:*:*:*:*
mozilla thunderbird 3.0.4 cpe:2.3:a:mozilla:thunderbird:3.0.4:*:*:*:*:*:*:*
mozilla thunderbird 3.0.5 cpe:2.3:a:mozilla:thunderbird:3.0.5:*:*:*:*:*:*:*
mozilla thunderbird 3.0.6 cpe:2.3:a:mozilla:thunderbird:3.0.6:*:*:*:*:*:*:*
mozilla thunderbird 3.0.7 cpe:2.3:a:mozilla:thunderbird:3.0.7:*:*:*:*:*:*:*
mozilla thunderbird 3.0.8 cpe:2.3:a:mozilla:thunderbird:3.0.8:*:*:*:*:*:*:*
mozilla thunderbird 3.0.9 cpe:2.3:a:mozilla:thunderbird:3.0.9:*:*:*:*:*:*:*
mozilla thunderbird 3.1.1 cpe:2.3:a:mozilla:thunderbird:3.1.1:*:*:*:*:*:*:*
mozilla thunderbird 3.1.2 cpe:2.3:a:mozilla:thunderbird:3.1.2:*:*:*:*:*:*:*
mozilla thunderbird 3.1.3 cpe:2.3:a:mozilla:thunderbird:3.1.3:*:*:*:*:*:*:*
mozilla thunderbird 3.1.4 cpe:2.3:a:mozilla:thunderbird:3.1.4:*:*:*:*:*:*:*
mozilla thunderbird 3.1.5 cpe:2.3:a:mozilla:thunderbird:3.1.5:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*

References for CVE-2010-3765

URL Tags
http://blog.mozilla.com/security/2010/10/26/critical-vulnerability-in-firefox-3-5-and-firefox-3-6/ Vendor Advisory
http://blogs.sun.com/security/entry/multiple_vulnerabilities_in_mozilla_firefox Broken Link
http://isc.sans.edu/diary.html?storyid=9817 Press/Media Coverage
http://lists.fedoraproject.org/pipermail/package-announce/2010-November/050233.html Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050061.html Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050077.html Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050154.html Third Party Advisory
http://norman.com/about_norman/press_center/news_archive/2010/129223/en?utm_source=twitterfeed&utm_medium=twitter Product
http://secunia.com/advisories/41761 Vendor Advisory
http://secunia.com/advisories/41965 Vendor Advisory
http://secunia.com/advisories/41966 Vendor Advisory
http://secunia.com/advisories/41969 Vendor Advisory
http://secunia.com/advisories/41975 Vendor Advisory
http://secunia.com/advisories/42003 Vendor Advisory
http://secunia.com/advisories/42008 Vendor Advisory
http://secunia.com/advisories/42043 Vendor Advisory
http://secunia.com/advisories/42867 Vendor Advisory
http://slackware.com/security/viewer.php?l=slackware-security&y=2010&m=slackware-security.556706 Third Party Advisory
http://support.avaya.com/css/P8/documents/100114329 Third Party Advisory
http://support.avaya.com/css/P8/documents/100114335 Third Party Advisory
http://www.debian.org/security/2010/dsa-2124 Third Party Advisory
http://www.exploit-db.com/exploits/15341 Exploit
http://www.exploit-db.com/exploits/15342 Exploit
http://www.exploit-db.com/exploits/15352 Exploit
http://www.mandriva.com/security/advisories?name=MDVSA-2010:213 Third Party Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2010:219 Third Party Advisory
http://www.mozilla.org/security/announce/2010/mfsa2010-73.html Third Party Advisory
http://www.norman.com/about_norman/press_center/news_archive/2010/129223/ Broken Link
http://www.norman.com/security_center/virus_description_archive/129146/ Broken Link
http://www.redhat.com/support/errata/RHSA-2010-0808.html Third Party Advisory
http://www.redhat.com/support/errata/RHSA-2010-0809.html Third Party Advisory
http://www.redhat.com/support/errata/RHSA-2010-0810.html Third Party Advisory
http://www.redhat.com/support/errata/RHSA-2010-0861.html Third Party Advisory
http://www.redhat.com/support/errata/RHSA-2010-0896.html Third Party Advisory
http://www.securityfocus.com/bid/44425 Broken Link
http://www.securitytracker.com/id?1024645 Broken Link
http://www.securitytracker.com/id?1024650 Broken Link
http://www.securitytracker.com/id?1024651 Broken Link
http://www.ubuntu.com/usn/USN-1011-2 Third Party Advisory
http://www.ubuntu.com/usn/USN-1011-3 Third Party Advisory
http://www.ubuntu.com/usn/usn-1011-1 Third Party Advisory
http://www.vupen.com/english/advisories/2010/2837 Vendor Advisory
http://www.vupen.com/english/advisories/2010/2857 Vendor Advisory
http://www.vupen.com/english/advisories/2010/2864 Vendor Advisory
http://www.vupen.com/english/advisories/2010/2871 Vendor Advisory
http://www.vupen.com/english/advisories/2011/0061 Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=607222 Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=607222#c53 Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=646997 Issue Tracking
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12108 Third Party Advisory
https://rhn.redhat.com/errata/RHSA-2010-0812.html Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2010-3765 US Government Resource
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