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NVD / CVE Program· CNA mitre

CVE-2011-2371: Integer overflow in the Array.reduceRight method in Mozilla Firefox before 3.6.18 and 4.x through 4.0.1, Thunderbird before 3.1.11, and…

CriticalCVSS 10.0 · v2.0—Weaponized Fix available

Noroxi assessment

Priority: This week (action score 63/100)

  • A ready-made attack module is public (Metasploit); exploiting it takes no special expertise.
  • Public proof-of-concept code exists (Exploit-DB); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 75.6% (FIRST EPSS); higher than 99.5% of all records.
  • No special conditions are required; it is repeatable.
  • Fixed version: xulrunner (Debian:5.0) 1.9.0.19-12; iceape (Debian:6.0) 2.0.11-6; icedove (Debian:6.0) 3.0.11-1+squeeze3.

Don’t wait for the next maintenance window. Upgrade to xulrunner (Debian:5.0) 1.9.0.19-12; iceape (Debian:6.0) 2.0.11-6; icedove (Debian:6.0) 3.0.11-1+squeeze3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Integer overflow in the Array.reduceRight method in Mozilla Firefox before 3.6.18 and 4.x through 4.0.1, Thunderbird before 3.1.11, and SeaMonkey through 2.0.14 allows remote attackers to execute arbitrary code via vectors involving a long JavaScript Array object.

Published
Jun 30, 2011
Updated
Jun 16, 2026
EPSS
75.6% · 99th percentile

Report tools

JSON

Action score

63

This week

Don’t wait for the next maintenance window.

CVSS
40 / 40 · 10.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
23 / 30 · 75.6%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Weaponized exploit exists
  • A fix has been released

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Follow CVE-2011-2371

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mozillaseamonkey
mozillafirefox
mozillathunderbird

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mozilla firefoxup to 3.6.17 inclusive
  • mozilla firefox1.0
  • mozilla firefox1.0.1
  • mozilla firefox1.0.2
  • mozilla firefox1.0.3
  • mozilla firefox1.0.4
  • mozilla firefox1.0.5
  • mozilla firefox1.0.6
+12 more rows
  • mozilla firefox1.0.7
  • mozilla firefox1.0.8
  • mozilla firefox1.5
  • mozilla firefox1.5.0.1
  • mozilla firefox1.5.0.10
  • mozilla firefox1.5.0.11
  • mozilla firefox1.5.0.12
  • mozilla firefox1.5.0.2
  • mozilla firefox1.5.0.3
  • mozilla firefox1.5.0.4
  • mozilla firefox1.5.0.5
  • mozilla firefox1.5.0.6

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:5.0xulrunnerbefore 1.9.0.19-121.9.0.19-12
Debian:6.0iceapebefore 2.0.11-62.0.11-6
Debian:6.0icedovebefore 3.0.11-1+squeeze33.0.11-1+squeeze3
Debian:6.0iceweaselbefore 3.5.16-83.5.16-8
Red Hat:enterprise_linux:4::asfirefoxbefore 0:3.6.18-2.el40:3.6.18-2.el4
Red Hat:enterprise_linux:4::asfirefox-debuginfobefore 0:3.6.18-2.el40:3.6.18-2.el4
Red Hat:enterprise_linux:4::asseamonkeybefore 0:1.0.9-71.el40:1.0.9-71.el4
Red Hat:enterprise_linux:4::asseamonkey-chatbefore 0:1.0.9-71.el40:1.0.9-71.el4
Red Hat:enterprise_linux:4::asseamonkey-debuginfobefore 0:1.0.9-71.el40:1.0.9-71.el4
Red Hat:enterprise_linux:4::asseamonkey-develbefore 0:1.0.9-71.el40:1.0.9-71.el4
Red Hat:enterprise_linux:4::asseamonkey-dom-inspectorbefore 0:1.0.9-71.el40:1.0.9-71.el4
Red Hat:enterprise_linux:4::asseamonkey-js-debuggerbefore 0:1.0.9-71.el40:1.0.9-71.el4
Red Hat:enterprise_linux:4::asseamonkey-mailbefore 0:1.0.9-71.el40:1.0.9-71.el4
Red Hat:enterprise_linux:4::asthunderbirdbefore 0:1.5.0.12-39.el40:1.5.0.12-39.el4
Red Hat:enterprise_linux:4::asthunderbird-debuginfobefore 0:1.5.0.12-39.el40:1.5.0.12-39.el4
Red Hat:enterprise_linux:5::clientthunderbirdbefore 0:2.0.0.24-18.el5_60:2.0.0.24-18.el5_6
Red Hat:enterprise_linux:5::clientthunderbird-debuginfobefore 0:2.0.0.24-18.el5_60:2.0.0.24-18.el5_6
Red Hat:enterprise_linux:5::serverfirefoxbefore 0:3.6.18-1.el5_60:3.6.18-1.el5_6
Red Hat:enterprise_linux:5::serverfirefox-debuginfobefore 0:3.6.18-1.el5_60:3.6.18-1.el5_6
Red Hat:enterprise_linux:5::serverxulrunnerbefore 0:1.9.2.18-2.el5_60:1.9.2.18-2.el5_6
Red Hat:enterprise_linux:5::serverxulrunner-debuginfobefore 0:1.9.2.18-2.el5_60:1.9.2.18-2.el5_6
Red Hat:enterprise_linux:5::serverxulrunner-develbefore 0:1.9.2.18-2.el5_60:1.9.2.18-2.el5_6
Red Hat:enterprise_linux:6::serverfirefoxbefore 0:3.6.18-1.el6_10:3.6.18-1.el6_1
Red Hat:enterprise_linux:6::serverfirefox-debuginfobefore 0:3.6.18-1.el6_10:3.6.18-1.el6_1

+3

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2013-1710The crypto.generateCRMFRequest function in Mozilla Firefox before 23.0, Firefox ESR 17.x before 17.0.8, Thunderbird before 17.0.8…
    53Plan
  • CVE-2013-5601Use-after-free vulnerability in the nsEventListenerManager::SetEventHandler function in Mozilla Firefox before 25.0, Firefox ESR 17.x…
    42Plan
  • CVE-2013-5590Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 25.0, Firefox ESR 17.x before 17.0.10 and 24.x before…
    42Plan

Published before and after this one in the same product

  • ← EarlierCVE-2011-2362Jun 30, 2011 · Mozilla Firefox before 3.6.18, Thunderbird before 3.1.11, and SeaMonkey through 2.0.14 do not distinguish between cookies for two domain…
    21Monitor
  • ← EarlierCVE-2011-2363Jun 30, 2011 · Use-after-free vulnerability in the nsSVGPointList::AppendElement function in the implementation of SVG element lists in Mozilla Firefox…
    42Plan
  • Later →CVE-2011-2373Jun 30, 2011 · Use-after-free vulnerability in Mozilla Firefox before 3.6.18 and 4.x through 4.0.1, Thunderbird before 3.1.11, and SeaMonkey through…
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:iceape2.0.11-6 · Debian:6.0Package registry (OSV)
debian:icedove3.0.11-1+squeeze3 · Debian:6.0Package registry (OSV)
debian:iceweasel3.5.16-8 · Debian:6.0Package registry (OSV)
debian:xulrunner1.9.0.19-12 · Debian:5.0Package registry (OSV)
red hat:firefox0:3.6.18-2.el4 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:firefox-debuginfo0:3.6.18-2.el4 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:seamonkey0:1.0.9-71.el4 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:seamonkey-chat0:1.0.9-71.el4 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:seamonkey-debuginfo0:1.0.9-71.el4 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:seamonkey-devel0:1.0.9-71.el4 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:seamonkey-dom-inspector0:1.0.9-71.el4 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:thunderbird0:1.5.0.12-39.el4 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:thunderbird-debuginfo0:1.5.0.12-39.el4 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:xulrunner0:1.9.2.18-2.el5_6 · Red Hat:enterprise_linux:5::serverPackage registry (OSV)
red hat:xulrunner-debuginfo0:1.9.2.18-2.el5_6 · Red Hat:enterprise_linux:5::serverPackage registry (OSV)
red hat:xulrunner-devel0:1.9.2.18-2.el5_6 · Red Hat:enterprise_linux:5::serverPackage registry (OSV)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Metasploit module ×1
  • Exploit-DB entry ×3

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entryremote2011-10-12
Exploit-DB entryremote2011-10-13
Exploit-DB entryremote2012-02-27
Metasploit moduleexploit/windows/browser/mozilla_reducerightMozilla Firefox Array.reduceRight() Integer Overflowexploit2011-06-21

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Metasploit-10 d
  2. Published
  3. First PoC+103 d
  4. TodayNov 15, 2026+5617 d

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • No special conditions are required; it is repeatable.

If successful

Confidentiality
C · data can be read
Integrity
C · data or configuration can be modified
Availability
C · the service can be disrupted
Attack complexity
Low
Confidentiality impact
C
Integrity impact
C
Availability impact
C

Weakness class (CWE)

CWE-189 · Numeric Errors

CVSS vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (15 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records