CVE-2011-2371

NONECVSS 0.09.0▲
EchelonGraph scoreLOW confidence

Score elevated to 9.0 because EPSS predicts 86% probability of exploitation within the next 30 days (top 0.6% of all CVEs). Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss
Weaponized
0.0
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 76%
CISA-KEV: Not listedEPSS: 76%CVSS: —Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
—
EG Score
9.0(low)
EPSS
99.5%
KEV
Not listed

Published

June 30, 2011

Last Modified

April 29, 2026

References (32)

Vendor Advisories for CVE-2011-2371(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox (5.0+build1+nobinonly-0ubuntu0.11.04.1) @ natty2026-05-29ubuntu
ubuntuxulrunner-1.9.2 (1.9.2.18+build2+nobinonly-0ubuntu0.10.10.1) @ maverick2026-05-29ubuntu
ubuntuthunderbird (3.1.11+build2+nobinonly-0ubuntu0.11.04.1) @ natty2026-05-29ubuntu
redhatthunderbird-0:2.0.0.24-18.el5_62011-06-21redhat
redhatseamonkey-0:1.0.9-71.el42011-06-21redhat
redhatxulrunner-0:1.9.2.18-2.el6_12011-06-21redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 3× in last 7d / 24× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-04 06:27 UTCEPSS rescore
  2. 2026-07-01 15:02 UTCEPSS rescore
  3. 2026-07-01 15:02 UTCEPSS rescore
  4. 2026-06-28 14:03 UTCEPSS rescore
  5. 2026-06-28 04:53 UTCEPSS rescore
  6. 2026-06-28 04:52 UTCEPSS rescore
  7. 2026-06-25 13:46 UTCEPSS rescore
  8. 2026-06-23 21:30 UTCEPSS rescore
  9. 2026-06-23 21:30 UTCEPSS rescore
  10. 2026-06-21 01:56 UTCEPSS rescore
  11. 2026-06-21 01:56 UTCEPSS rescore
  12. 2026-06-18 17:49 UTCEPSS rescore
  13. 2026-06-18 17:49 UTCEPSS rescore
  14. 2026-06-17 17:49 UTCEPSS rescore
  15. 2026-06-17 17:49 UTCEPSS rescore
  16. 2026-06-17 17:49 UTCEPSS rescore
  17. 2026-06-15 17:44 UTCEPSS rescore
  18. 2026-06-13 22:57 UTCEPSS rescore
  19. 2026-06-13 22:57 UTCEPSS rescore
  20. 2026-06-12 23:08 UTCEPSS rescore
  21. 2026-06-11 13:56 UTCEPSS rescore
  22. 2026-06-10 13:17 UTCEPSS rescore
  23. 2026-06-08 14:14 UTCEPSS rescore
  24. 2026-06-08 14:14 UTCEPSS rescore
  25. 2026-06-06 13:45 UTCEPSS rescore
Show 28 more
  1. 2026-06-06 13:44 UTCEPSS rescore
  2. 2026-06-05 22:44 UTCEPSS rescore
  3. 2026-06-02 20:10 UTCEPSS rescore
  4. 2026-06-02 20:10 UTCEPSS rescore
  5. 2026-06-01 13:49 UTCEPSS rescore
  6. 2026-06-01 13:49 UTCEPSS rescore
  7. 2026-05-31 00:14 UTCEPSS rescore
  8. 2026-05-31 00:14 UTCEPSS rescore
  9. 2026-05-29 13:41 UTCEPSS rescore
  10. 2026-05-29 13:40 UTCEPSS rescore
  11. 2026-05-29 07:38 UTCEG score recompute
  12. 2026-05-29 07:38 UTCVendor advisory
  13. 2026-05-29 07:38 UTCGHSA enrichment
  14. 2026-05-28 13:42 UTCEPSS rescore
  15. 2026-05-28 13:42 UTCEPSS rescore
  16. 2026-05-28 13:42 UTCEPSS rescore
  17. 2026-05-27 13:38 UTCEPSS rescore
  18. 2026-05-27 13:38 UTCEPSS rescore
  19. 2026-05-26 13:41 UTCEPSS rescore
  20. 2026-05-26 13:41 UTCEPSS rescore
  21. 2026-05-22 21:15 UTCEPSS rescore
  22. 2026-05-22 21:15 UTCEPSS rescore
  23. 2026-05-22 21:15 UTCEPSS rescore
  24. 2026-05-20 22:37 UTCEPSS rescore
  25. 2026-05-20 22:37 UTCEPSS rescore
  26. 2026-05-20 22:37 UTCEPSS rescore
  27. 2026-05-18 21:29 UTCEPSS rescore
  28. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(4 references)

Working exploit code is in the public domain (1 Metasploit module) (3 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-18531
    First seen Feb 27, 2012

    Mozilla Firefox 4.0.1 - 'Array.reduceRight()' Remote Overflow

    Open source ↗
  • Exploit-DBEDB-17976✓ verified
    First seen Oct 13, 2011

    Mozilla Firefox - 'Array.reduceRight()' Integer Overflow (Metasploit) (2)

    Open source ↗
  • Exploit-DBEDB-17974✓ verified
    First seen Oct 12, 2011

    Mozilla Firefox - 'Array.reduceRight()' Integer Overflow (1)

    Open source ↗
  • Metasploitexploit/windows/browser/mozilla_reduceright✓ verified
    First seen Jun 21, 2011

    Mozilla Firefox Array.reduceRight() Integer Overflow

    Open source ↗

Related CVEs(same vendor)

Frequently asked(4)

What is CVE-2011-2371?
CVE-2011-2371 is a none vulnerability published on June 30, 2011. 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.
When was CVE-2011-2371 disclosed?
CVE-2011-2371 was first published in the National Vulnerability Database on June 30, 2011, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2011-2371 actively exploited?
CVE-2011-2371 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2011-2371?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-2371, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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