CVE-2011-2371

HIGHCVSS v2 · 10.010.0
EchelonGraph scoreLOW confidence

“—” beside the score: it is equal to NVD's CVSS v2 base score.

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 10.0 — NVD rates that HIGH (NVD's v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; no CRITICAL band). Vector AV:N/AC:L/Au:N/C:C/I:C/A:C. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 76% exploitation probability in the next 30 days; it does not lift the v2 base. EPSS sets EG Risk's exploitation input. Confidence: LOW.

Triggered by: NVD CVSS v2.0 (legacy fallback)
Sources: NVD CVSS v2.0
Weaponized

Also known asEUVD-2011-2360 (ENISA EUVD) · GHSA-2ph2-r6cr-hgrj (GitHub Security Advisories)Source: ENISA EUVD

10.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High exploitation likelihood — EPSS 76%
  • Public exploit code is available (Metasploit, Exploit-DB, marked verified by Exploit-DB, other public proof-of-concept code)
CISA-KEV: Not listedEPSS PROB: 76%CVSS v2: 10.0Exploit: Metasploit · Exploit-DB (verified) · other public PoCExposed services: Not assessed

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 v2.0 (legacy)
10.0HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
10.0HIGHlow confidence
EG Risk
75
EG Risk 75/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity100% × 45%
Impact severity (EG Severity): CVSS 10.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation76% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
76%
EPSS %ILE
99th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (10.0): severity, escalated by confirmed exploitation. This CVE's 10.0 is its impact severity (EG Severity), not escalated.

EG Severity
10.0 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v2.0 · CVSS v2.0AV:N/AC:L/Au:N/C:C/I:C/A:C
EG Likelihood
76% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 30, 2011

Last Modified

April 29, 2026

Patch Availability(6)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuthunderbird (3.1.11+build2+nobinonly-0ubuntu0.11.04.1) @ natty2026-11-03ubuntu
ubuntufirefox (5.0+build1+nobinonly-0ubuntu0.11.04.1) @ natty2026-11-03ubuntu
ubuntuxulrunner-1.9.2 (1.9.2.18+build2+nobinonly-0ubuntu0.10.10.1) @ maverick2026-11-03ubuntu
redhatthunderbird-0:2.0.0.24-18.el5_62011-06-21redhat
redhatxulrunner-0:1.9.2.18-2.el6_12011-06-21redhat
redhatseamonkey-0:1.0.9-71.el42011-06-21redhat

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.

Affected Packages

(4 across 2 ecosystems)
Debian:6.0(3)
PackageVulnerable rangeFix by version rangeDependents
iceape2.0.11-2, 2.0.11-3, 2.0.11-4, 2.0.11-5
  • every version up to 2.0.11-6: fixed in 2.0.11-6
—
icedove3.0.11-1, 3.0.11-1+squeeze1, 3.0.11-1+squeeze2
  • every version up to 3.0.11-1+squeeze3: fixed in 3.0.11-1+squeeze3
—
iceweasel3.5.16-4 ... 3.5.16-8~bpo50+1 (8 versions)
  • every version up to 3.5.16-8: fixed in 3.5.16-8
—
Debian:5.0(1)
PackageVulnerable rangeFix by version rangeDependents
xulrunner1.9.0.10-1 ... 1.9.0.9-1 (30 versions)
  • every version up to 1.9.0.19-12: fixed in 1.9.0.19-12
—

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 18× in last 7d / 80× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 203 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 103 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 20:20 UTCEchelonGraph re-scored
  2. 2026-11-12 20:20 UTCVendor advisory
  3. 2026-11-12 20:20 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  4. 2026-11-12 16:26 UTCEPSS rescoreEPSS 76% · 99th percentile
  5. 2026-11-11 21:40 UTCEchelonGraph re-scored
  6. 2026-11-11 21:40 UTCVendor advisory
  7. 2026-11-11 21:40 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  8. 2026-11-11 16:27 UTCEPSS rescoreEPSS 76% · 99th percentile
  9. 2026-11-10 23:01 UTCEchelonGraph re-scored
  10. 2026-11-10 23:01 UTCVendor advisory
  11. 2026-11-10 23:01 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  12. 2026-11-10 16:28 UTCEPSS rescoreEPSS 76% · 99th percentile
  13. 2026-11-10 00:15 UTCEchelonGraph re-scored
  14. 2026-11-10 00:15 UTCVendor advisory
  15. 2026-11-10 00:15 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  16. 2026-11-09 01:36 UTCEchelonGraph re-scored
  17. 2026-11-09 01:36 UTCVendor advisory
  18. 2026-11-09 01:36 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  19. 2026-11-08 02:57 UTCEchelonGraph re-scored
  20. 2026-11-08 02:57 UTCVendor advisory
  21. 2026-11-08 02:57 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  22. 2026-11-07 16:27 UTCEPSS rescoreEPSS 76% · 99th percentile
  23. 2026-11-07 04:18 UTCEchelonGraph re-scored
  24. 2026-11-07 04:18 UTCVendor advisory
  25. 2026-11-07 04:18 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
Show 75 more
  1. 2026-11-06 05:32 UTCEchelonGraph re-scored
  2. 2026-11-06 05:32 UTCVendor advisory
  3. 2026-11-06 05:32 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  4. 2026-11-05 16:26 UTCEPSS rescoreEPSS 76% · 99th percentile
  5. 2026-11-05 06:53 UTCEchelonGraph re-scored
  6. 2026-11-05 06:53 UTCVendor advisory
  7. 2026-11-05 06:53 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  8. 2026-11-04 08:13 UTCEchelonGraph re-scored
  9. 2026-11-04 08:13 UTCVendor advisory
  10. 2026-11-04 08:13 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  11. 2026-11-03 16:29 UTCEPSS rescoreEPSS 76% · 99th percentile
  12. 2026-11-03 09:32 UTCEchelonGraph re-scored
  13. 2026-11-03 09:32 UTCVendor advisory
  14. 2026-11-03 09:32 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  15. 2026-11-02 10:52 UTCEchelonGraph re-scored
  16. 2026-11-02 10:52 UTCVendor advisory
  17. 2026-11-02 10:52 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  18. 2026-11-01 12:13 UTCEchelonGraph re-scored
  19. 2026-11-01 12:13 UTCVendor advisory
  20. 2026-11-01 12:13 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  21. 2026-10-31 16:26 UTCEPSS rescoreEPSS 76% · 99th percentile
  22. 2026-10-31 13:34 UTCEchelonGraph re-scored
  23. 2026-10-31 13:34 UTCVendor advisory
  24. 2026-10-31 13:34 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  25. 2026-10-30 16:26 UTCEPSS rescoreEPSS 76% · 99th percentile
  26. 2026-10-30 14:54 UTCEchelonGraph re-scored
  27. 2026-10-30 14:54 UTCVendor advisory
  28. 2026-10-30 14:54 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  29. 2026-10-29 16:15 UTCVendor advisory
  30. 2026-10-29 16:15 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  31. 2026-10-28 17:35 UTCEchelonGraph re-scored
  32. 2026-10-28 17:35 UTCVendor advisory
  33. 2026-10-28 17:35 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  34. 2026-10-28 16:25 UTCEPSS rescoreEPSS 76% · 99th percentile
  35. 2026-10-27 18:52 UTCEchelonGraph re-scored
  36. 2026-10-27 18:52 UTCVendor advisory
  37. 2026-10-27 18:52 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  38. 2026-10-27 16:25 UTCEPSS rescoreEPSS 76% · 99th percentile
  39. 2026-10-26 20:13 UTCEchelonGraph re-scored
  40. 2026-10-26 20:13 UTCVendor advisory
  41. 2026-10-26 20:13 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  42. 2026-10-25 19:35 UTCEchelonGraph re-scored
  43. 2026-10-25 19:35 UTCVendor advisory
  44. 2026-10-25 19:35 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  45. 2026-10-25 16:26 UTCEPSS rescoreEPSS 76% · 99th percentile
  46. 2026-10-24 20:52 UTCEchelonGraph re-scored
  47. 2026-10-24 20:52 UTCVendor advisory
  48. 2026-10-24 20:52 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  49. 2026-10-23 22:13 UTCEchelonGraph re-scored
  50. 2026-10-23 22:13 UTCVendor advisory
  51. 2026-10-23 22:13 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  52. 2026-10-23 16:26 UTCEPSS rescoreEPSS 76% · 99th percentile
  53. 2026-10-22 23:24 UTCEchelonGraph re-scored
  54. 2026-10-22 23:24 UTCVendor advisory
  55. 2026-10-22 23:24 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  56. 2026-10-22 16:26 UTCEPSS rescoreEPSS 76% · 99th percentile
  57. 2026-10-22 00:45 UTCEchelonGraph re-scored
  58. 2026-10-22 00:45 UTCVendor advisory
  59. 2026-10-22 00:45 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  60. 2026-10-21 16:26 UTCEPSS rescoreEPSS 76% · 99th percentile
  61. 2026-10-21 01:55 UTCEchelonGraph re-scored
  62. 2026-10-21 01:55 UTCVendor advisory
  63. 2026-10-21 01:55 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  64. 2026-10-20 16:26 UTCEPSS rescoreEPSS 76% · 99th percentile
  65. 2026-10-20 03:16 UTCEchelonGraph re-scored
  66. 2026-10-20 03:16 UTCVendor advisory
  67. 2026-10-20 03:15 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  68. 2026-10-19 03:40 UTCEchelonGraph re-scored
  69. 2026-10-19 03:40 UTCVendor advisory
  70. 2026-10-19 03:39 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  71. 2026-10-18 04:58 UTCEchelonGraph re-scored
  72. 2026-10-18 04:58 UTCVendor advisory
  73. 2026-10-18 04:58 UTCGHSA enrichmentGHSA-2ph2-r6cr-hgrj · GitHub severity HIGH
  74. 2026-10-17 16:26 UTCEPSS rescoreEPSS 76% · 99th percentile
  75. 2026-10-17 05:27 UTCVendor advisory

Publicly available exploits

(4 references)

Public exploit code is referenced for this CVE (1 Metasploit module, 3 Exploit-DB entries). Defenders should treat patch urgency accordingly.

  • Exploit-DBEDB-17976✓ verified
    Published Oct 13, 2011

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

    Open source ↗
  • Metasploitexploit/windows/browser/mozilla_reduceright✓ verified
    Published Oct 13, 2011

    Mozilla Firefox Array.reduceRight() Integer Overflow

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

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

    Open source ↗
  • Exploit-DBEDB-18531
    Published Feb 27, 2012

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

    Open source ↗

Frequently asked(4)

What is CVE-2011-2371?
CVE-2011-2371 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2011-2371 was made public on June 21, 2011: that is the date its CVE record's CNA, MITRE Corporation, gives for when the vulnerability was made public. The CVE record itself was published on June 30, 2011. EchelonGraph's copy of the record carries a last-modified date of April 29, 2026; the record at its source may have been updated since.
Is CVE-2011-2371 actively exploited?
CVE-2011-2371 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model places it in Tier 2 (Weaponized), which is not evidence of exploitation: a Metasploit module exists for it, and Exploit-DB marks a public exploit for it as verified. EchelonGraph does not test whether exploit code works. FIRST EPSS estimates a 76% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
How do I remediate CVE-2011-2371?
A fix for CVE-2011-2371 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2011-2371 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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